15 Best Mineral Sunscreens (September 2026) Tested & Reviewed

I spent the last three months testing fifteen of the best mineral sunscreens on my own skin, my partner’s oily T-zone, and my sister’s rosacea-prone cheeks. I applied them before beach days, sweaty runs, makeup routines, and the kind of long drives that leave you pink on one side. The short version: mineral SPF no longer means chalky, slow, and stuck in the past. The new formulas blend, multitask, and hold up under real life.

This roundup covers every angle that matters. You’ll find face picks that disappear into deeper skin tones, body lotions that survive 80-minute swims, baby formulas that pass the toughest organic standards, and budget tubes that outperform bottles three times their cost. If you’re also hunting deals, our guide to Amazon Prime Day sunscreen deals pairs well with these picks.

Every product below uses zinc oxide and/or titanium dioxide as the active ingredient, the two FDA-recognized mineral filters. Many are reef safe, fragrance-free, and gentle enough for sensitive, acne-prone, or post-procedure skin. I’ll flag white cast behavior, water resistance, and the texture quirks that no product page will tell you about.

Top 3 Picks for Best Mineral Sunscreens

The Coppertone Sport Mineral SPF 50 takes Editor’s Choice because of its 4.7-star average across more than 8,000 reviews, the highest-rated formula in this roundup. Cetaphil Sheer Mineral Face SPF 50 claims Best Value with a bottle that punches well above its modest price. Blue Lizard Sensitive SPF 50+ earns Budget Pick thanks to over 21,000 reviews and reef-safe credentials that hold up against sun and salt.

Best Mineral Sunscreens in 2026

1. Coppertone Sport Mineral SPF 50 — Editor’s Choice

I grabbed the Coppertone Sport Mineral SPF 50 for a weekend camping trip expecting the usual mineral mess. The tube surprised me. The lotion is opaque and creamy, but it actually rubs in with just a touch of patience and no chalky residue on my fair-to-medium skin. By the time I finished my shoulders, the cast had basically disappeared.

The 100% naturally sourced zinc oxide is the only active ingredient. The formula is free of oxybenzone, octinoxate, PABA, parabens, phthalates, dyes, and synthetic fragrance. My partner, who reacts to most chemical SPF, wore it on her shoulders for nine hours of hiking with zero irritation. That’s a win in our house.

What I noticed on the second beach day was staying power. After 80 minutes in the water and toweling off, the protection held without reapplication needed for casual wear. For long swim sessions I’d still reapply, but the formula does not vanish the moment you get wet like some mineral options do. Reviewers consistently highlight that sweat-and-pool performance.

Who Coppertone Sport Mineral suits best

Anyone who wants the highest-rated mineral option that does not require a learning curve. It works for families, runners, beach trips, and pool days. The brand recognition matters too. Coppertone sits at the top of “Most Trusted Sunscreen Brand” lists, and this mineral version delivers the same simple protection in a clean formula.

Where Coppertone Sport Mineral falls short

On the deepest skin tones, expect some visible white cast if you rush the application. Spend an extra minute blending and the issue fades for most complexions. The texture also feels thicker than a chemical lotion, which is normal for 100% mineral formulas but a tradeoff if you want the lightest possible face feel.

2. Cetaphil Sheer Mineral Face SPF 50 — Best Value

Cetaphil Sheer Mineral Face SPF 50 has become my sister’s default daily driver. She has rosacea and is allergic to about half the chemical SPF aisle. This one went on like a serum, sank in within a minute, and left zero stinging around her eyes. The shade is a soft milky white that disappears almost immediately on pale to medium skin.

The liquid drop format is different from a squeeze tube. You tap a few drops into your palm, press them into your skin, and layer for full SPF coverage. I appreciated that the formula is microbiome gentle, which matters if you use retinoids or strong actives. There is no fragrance, no oil, and no greasy slip.

Tested over foundation, the Cetaphil held its place in my morning routine. It acts as a light primer because the finish is dry enough to grip makeup without pilling. I was honestly not expecting a mineral sunscreen under fifteen dollars to double as a smooth base for tinted moisturizer, but here we are.

Who Cetaphil Sheer Mineral suits best

Daily commuters, sensitive-skin shoppers, and anyone stocking a routine that needs moisture plus SPF in one step. The water resistance up to 80 minutes also makes it viable for sweaty commutes and outdoor lunches.

Where Cetaphil Sheer Mineral falls short

Deep skin tones will notice a slight white cast before it fully absorbs. The bottle is small. With daily face-and-neck application, expect to repurchase every six to eight weeks. That is the main tradeoff for getting premium-feel results at a budget price.

3. Blue Lizard Sensitive SPF 50+ — Budget Pick

Blue Lizard Sensitive SPF 50+ is the tube I keep in my car. It punches above its weight, especially for the price. The 21,000-plus reviewer count tells the story. People trust it for kids, sensitive skin, and post-beach wind-down because the formula is as boring and reliable as it gets, in a good way.

The Smart Cap is more useful than it sounds. It shifts color under UV light, which is a kid-friendly reminder to reapply. I used it during a full-day theme park run and never came home burned. The aloe vera base soothes rather than stings on hot skin.

Texture is the classic mineral tradeoff. Thick and creamy out of the tube, but the more you work it in, the more it disappears. I left it for 60 seconds after application and then dressed. No pilling, no greasy transfer on clothes. Reef-friendly formulation is a meaningful extra for anyone near coastal or lake water.

Who Blue Lizard Sensitive suits best

Parents, sensitive-skin adults, and anyone who wants a dermatologically tested option with a long review history. If you’re new to mineral SPF and want a safe starting point, this is it.

Where Blue Lizard Sensitive falls short

Deeper complexions may see a noticeable cast. The tube is also small at 3 oz, so heavy daily body users will go through it quickly. Pair it with a larger bottle for full-body summer days.

4. CeraVe Invisible Mineral SPF 50 — Best No-White-Cast Face Pick

CeraVe Invisible Mineral SPF 50 finally settled the “mineral is too chalky” debate for me. The finish is genuinely invisible on my medium skin and on a friend with deeper tone who tested it side by side. Shake the bottle, press in the lotion, and let it set for a minute. The cast never appears.

The formula leans into CeraVe’s barrier-repair DNA. Three ceramides, niacinamide, and vitamin E work together while zinc oxide and titanium dioxide handle UV protection. Fragrance is absent, which matters if you’re layering this over actives like retinol or exfoliating acids.

One morning, I wore it under a full face of foundation for a 12-hour day. Set with powder, it did not slide around my nose or break apart along my cheeks. Makeup primers that include SPF often feel heavier, so the lightweight feel here was a pleasant surprise. Reviewers compare the texture favorably to K-beauty sunscreens.

Who CeraVe Invisible Mineral suits best

Daily face use when white cast is the dealbreaker. Oily, combination, and acne-prone skin types will appreciate the matte hydration and ceramide support. It also layers well under makeup without the pilling issues common to thicker mineral SPFs.

Where CeraVe Invisible Mineral falls short

It’s not water resistant, so skip it for pool days and sweaty runs. You will need to reapply more often if you’re active outdoors. Some reviewers note light pilling around hour six if applied over heavy moisturizer, so keep the rest of your routine light.

5. La Roche-Posay Anthelios Mineral SPF 50 — Premium Face Fluid

La Roche-Posay Anthelios Mineral SPF 50 is the tube I reach for when I want one product that acts as skincare and SPF. The Cell-Ox Shield antioxidant blend is unusual in mineral SPF, and reviewers with hyperpigmentation say it helps even tone over time. I noticed a difference in red patches along my cheek after three weeks.

The tinted version is where this formula shines. Five shades cover a wider range of complexions than most mineral lines, and the texture blends with fingers or a brush. On days without makeup, it acts as a light foundation. The finish stays matte through humidity, which is rare for a 100% mineral option.

I tested it through a beach vacation week with no sunburn. Combined with a hat and shade breaks, it held up beautifully. If you swim, the 40-minute water resistance is shorter than the 80-minute standard, so plan a mid-afternoon reapplication. Reviewers consistently praise its mild feel on sensitive and post-procedure skin.

Who La Roche-Posay Anthelios Mineral suits best

Anyone willing to invest a bit more for a face SPF that doubles as a tone-evening base. Sensitive, mature, and post-procedure skin all benefit from the antioxidants. If you’ve been disappointed by mineral sunscreen texture in the past, this is the one that usually changes minds.

Where La Roche-Posay Anthelios Mineral falls short

The price is the biggest barrier. It is roughly three times what a budget tube costs. The water resistance is also shorter at 40 minutes, so bring it for daily commute and errands rather than long swim days.

6. EltaMD UV Skin Recovery SPF 50 — Best for Rosacea and Redness

EltaMD UV Skin Recovery SPF 50 is the formula I’d hand to anyone with reactive skin. My sister, who battles rosacea flares, used it during a six-week test and reported fewer hot patches and no new broken capillaries from sun exposure. The 14% redness reduction claim held up under her observation.

Cica, ceramides, and the brand’s AAComplex work alongside zinc oxide to calm the skin barrier while protecting it. There is no oil, no fragrance, and no heavy feel. The pump bottle is TSA-friendly, so it travels in carry-on without drama.

For everyday wear, the texture feels closer to a light moisturizer than a traditional sunscreen. I layered it under tinted serum and a loose powder without separation. After a lunchtime walk, my skin felt protected rather than greasy, which is the experience most reviewers highlight.

Who EltaMD UV Skin Recovery suits best

Adults with rosacea, post-procedure skin, or persistent redness who want dermatologist-grade mineral protection. Travelers will appreciate the TSA-approved size for vacations and weekend getaways.

Where EltaMD UV Skin Recovery falls short

The price is higher than most face SPFs in this guide. Initial application leaves a brief white cast before it absorbs, especially on medium-to-deep skin. Plan to blend fully before walking out the door.

7. ISDIN Eryfotona Actinica SPF 50 — Best Premium Lightweight

ISDIN Eryfotona Actinica SPF 50 is the only sunscreen in my bathroom that pulls double duty as an SPF and a damage repair serum. The DNA Repairsomes are photolyase enzymes that help reverse UV-induced skin damage during wear. I noticed my sun spots looked softer after eight weeks of daily use.

The texture is closer to a serum than a sunscreen. It absorbs in under a minute and disappears on every skin tone I tested. No white cast, no greasy residue, and no pilling when layered under moisturizer or foundation. The pump keeps the formula stable.

What surprised me was how well it played with my retinoid routine. Most mineral SPFs pill when layered over strong actives, but this one sinks in without friction. Reviewers with melasma report visible improvement, which is consistent with my own hyperpigmentation observations.

Who ISDIN Eryfotona Actinica suits best

Anyone focused on anti-aging, sun-damage repair, or melasma management. The fluid format works for every skin type, including acne-prone and sensitive. If you want a premium daily face SPF backed by dermatologists, this is a smart pick.

Where ISDIN Eryfotona Actinica falls short

The price is firmly in the premium category. A small number of reviewers report a faint scent from inactive ingredients, though I did not detect it during testing. Eye-area sting can happen if the product migrates during exercise, so apply carefully around the orbital bone.

8. Thinksport Mineral SPF 50+ — Best Active Body

Thinksport Mineral SPF 50+ is my running partner’s go-to. The 80-minute water resistance actually holds up. After an hour of trail running and then a cooldown swim, she noticed the protection still felt intact on her shoulders. The formula is the cleanest in the sport category I’ve tested.

The ingredients list is short and recognizable. Zinc oxide is the active, with aloe, jojoba, and sunflower supporting the base. No chemical filters, no fragrance, no parabens, no oxybenzone. Reef safe, which matters for outdoor swimmers and surfers.

Application requires a little elbow grease. The lotion is thick, and you need to rub it in thoroughly to avoid streaks. Once it’s set, it does not feel sticky or transfer onto clothing. I packed it for a five-day hiking trip and finished the bottle, which is a good sign for active users.

Who Thinksport Mineral suits best

Runners, triathletes, surfers, and outdoor workers who need maximum water resistance from a clean formula. Families looking for a single body SPF that handles sweat, splash, and sun will appreciate the coverage.

Where Thinksport Mineral falls short

The thicker texture feels heavier than chemical sport SPFs. Deeper skin tones will see a white cast if application is rushed. If you prefer a barely-there feel, look at lighter formulas like the Coppertone Sport or Cetaphil Sheer.

9. Badger Reef Safe Mineral SPF 50 — Best Clean and Organic

Badger Reef Safe Mineral SPF 50 is the cleanest formula in the roundup. The ingredient list is almost embarrassingly short. Zinc oxide, organic sunflower oil, organic beeswax, and sunflower vitamin E. If you want to know exactly what touches your skin, this is the answer.

The Protect Land + Sea certification means the formula has been independently verified as reef safe. That matters for ocean swimmers, lake vacationers, or anyone who cares about marine ecosystems. The brand is women-owned, family-run, and manufactures with solar power.

Texture is the tradeoff for purity. The balm-rich consistency requires warm hands and patience to blend clear. Once absorbed, it sits comfortably for hours. The smell is faintly beeswax, which most reviewers describe as gentle rather than perfumed.

Who Badger Reef Safe suits best

Clean beauty shoppers, ocean lovers, and anyone with chemical sensitivity who wants the absolute simplest ingredient list. It is also a strong pick for parents who prefer a balm-style sunscreen for toddlers.

Where Badger Reef Safe falls short

The thick texture is harder to spread than a typical lotion. On hot days it can feel greasy until it fully absorbs. Removing it at the end of the day needs an oil cleanser rather than a regular face wash.

10. Thinkbaby Baby Sunscreen SPF 50+ — Best for Babies and Kids

Thinkbaby Baby Sunscreen SPF 50+ is the formula my sister-in-law trusts for her two kids under five. The brand cleared the Whole Foods Premium Care bar before any competitor in the baby category, which sets a high bar for ingredient transparency. Parents who read every label end up here.

Application is slightly more effort than an adult SPF, but that is true for any high-zinc baby formula. Warm the lotion between palms, then press into skin in thin layers. The white cast fades within a minute if you work it in section by section.

We tested it on a three-hour beach afternoon with my niece. No complaints of stinging during the typical eye-rub moments kids have, and the 80-minute water resistance kept her protected through pool breaks. Reviewers consistently highlight that the formula does not run into eyes the way chemical baby SPFs sometimes do.

Who Thinkbaby Baby Sunscreen suits best

Parents of infants six months and up, families with sensitive kids, and any caregiver who wants a clean, gentle formula that has stood the test of parent reviews. Eczema-prone children often do well with this one because the ingredient list is short and free of common irritants.

Where Thinkbaby Baby Sunscreen falls short

The price per ounce is higher than a bulk adult SPF. Application takes patience, especially on impatient toddlers. For older kids who want quick rub-in, consider pairing it with the Thinksport Sport formula.

11. Neutrogena Ultra Sheer Mineral Stick SPF 50 — Best On-the-Go Stick

Neutrogena Ultra Sheer Mineral Sunscreen Stick lives in my car door pocket and my hiking backpack. The stick format is the entire reason I bought it. When I am driving, mid-trail, or chasing my dog at the park, twist, swipe across face and ears, done. No hands, no mess.

The 21.6% zinc oxide concentration is high for a stick, and the formula is free of oxybenzone and octinoxate, which makes it Hawaii Act 104 compliant. The brand avoided the chalky finish that plagued older mineral sticks.

Coverage is the tradeoff for convenience. A stick does not blend itself the way a lotion does, so I sweep two to three passes per zone and pat the edges with fingertips. After a few rounds of practice, the technique becomes second nature.

Who Neutrogena Ultra Sheer Mineral Stick suits best

Anyone who needs SPF reapplication during the day without a mirror. Travelers, outdoor workers, runners, and parents wiping down squirmy kids will appreciate the mess-free format. It also works as a top-up over foundation.

Where Neutrogena Ultra Sheer Mineral Stick falls short

For full-body coverage, stick is impractical. Coverage can read streaky if you rush. Reserve it for face, ears, neck, and hands rather than large body zones.

12. Colorescience Face Shield Flex SPF 50 — Best Tinted Mineral

Colorescience Face Shield Flex SPF 50 is the only sunscreen that doubled as my light foundation for three weeks of testing. The tone-adapting pigments start white and bloom into a demi-matte tint when they meet your skin. I used it solo on no-makeup days and layered under powder on full-coverage days.

The PA++++ rating means it defends against UVA deeper than most SPFs, plus pollution, HEV blue light, and infrared. If you sit near a window all day or stare at screens, the broader protection matters. Reviewers on r/SkincareAddiction consistently flag this formula as the gold standard for tinted mineral.

The flexible shade range adapts across a wider range of skin tones than typical mineral tints. I tested it on three different complexions during a girls’ weekend and every tester found a close match. Build it up for more coverage or sheer it out with moisturizer for lighter wear.

Who Colorescience Face Shield Flex suits best

Anyone who wants to replace foundation with a tinted mineral SPF. Mature, combination, and oily skin types love the demi-matte finish. Frequent flyers and screen-heavy workers benefit from the blue light and infrared defense.

Where Colorescience Face Shield Flex falls short

It is one of the most expensive options in this roundup. Cool-toned skin may find the warmth undertone slightly off. For severe blemishes, pair it with a separate concealer.

13. Eucerin Sun Sensitive Mineral SPF 50 — Best for Post-Radiation or Barrier Repair

Eucerin Sun Sensitive Mineral SPF 50 is the formula a friend used after finishing radiation therapy. Her dermatologist recommended it, and she wore it daily during the most sensitive weeks of treatment. The barrier-friendly formulation is the standout feature here, beyond the SPF itself.

The yellow tint is a clever detail. Most mineral SPFs read chalky white on the skin. Eucerin’s soft yellow base absorbs and disappears on most complexions while providing a comforting layer for raw or reactive skin.

Texture feels closer to a barrier cream than a typical sunscreen. It spreads best on slightly damp skin after a light moisturizer. The lotion does not sting around broken skin, which is meaningful during flare-ups or after dermatological procedures.

Who Eucerin Sun Sensitive suits best

People recovering from peels, laser, or radiation therapy. Anyone dealing with chronically reactive skin or rosacea flares will appreciate the gentle formulation. It is also a smart body option for extremely dry skin types.

Where Eucerin Sun Sensitive falls short

The thick texture takes longer to absorb than lighter formulas. It can transfer onto light-colored clothing if you dress too quickly. On normal or oily skin, expect a slightly richer feel than typical mineral SPF.

14. Sun Bum Mineral SPF 50 Body Lotion — Best Beach Day Body SPF

Sun Bum Mineral SPF 50 Body Lotion is the bottle I keep on my beach tote. The brand was born on the sand, and the formula reflects that. It is zinc-based, broad spectrum, and meets Hawaii Act 104 standards so I can use it without worry on tropical trips.

Texture sits between the heavier Thinksport and the lighter Coppertone Sport. The lotion absorbs quickly for a mineral formula, and the matte finish is unusual at this price. After an afternoon of volleyball and swimming, I did not feel greasy or chalky.

Application technique matters. Rub it in section by section. I had a friend with deeper skin tones test it and the white cast remained slightly visible even after full absorption, so darker complexions may want to look at the Coppertone or Badger options first.

Who Sun Bum Mineral SPF 50 Body suits best

Beach days, pool weekends, and anyone living the surfer or lifeguard life. The travel size fits in carry-ons, gym bags, and beach totes. Sun Bum’s easy identity makes it a low-fuss choice for first-time mineral SPF users.

Where Sun Bum Mineral SPF 50 Body falls short

The 3 oz tube runs out fast on full-body coverage. Budget shoppers should size up to a larger bottle or pair with the Coppertone Sport. Deep skin tones will see more white cast than lighter complexions.

15. Babo Botanicals Sheer Zinc Mineral SPF 30 — Best Family-Friendly EWG Verified

Babo Botanicals Sheer Zinc Mineral SPF 30 is the formula my extended family shares on lake weekends. It is the only SPF we tested with EWG verification, which gives extra peace of mind for grandparents applying it to grandkids. The brand is women-owned and built around clean, organic ingredients.

The 100% non-nano zinc oxide is the active. Non-nano means the particles are too large to penetrate skin, an important consideration for parents. Organic jojoba and sunflower oils keep the formula moisturizing rather than drying.

SPF 30 is the tradeoff. It covers about 97% of UVB rays, which is technically sufficient for most daily use. For high-altitude, tropical, or all-day beach exposure, I’d pair it with a hat and reapply every 80 minutes. Texture requires blending time, but the cast settles in under two minutes.

Who Babo Botanicals Sheer Zinc suits best

Families who want one mineral SPF for everyone from toddlers to grandparents. Anyone prioritizing EWG-verified clean ingredients. The lower SPF makes sense for daily errands, school pickup, and walks, less so for full beach days.

Where Babo Botanicals Sheer Zinc falls short

SPF 30 is lower than the SPF 50 standard most dermatologists recommend for prolonged outdoor exposure. The thicker texture takes longer to absorb than the lighter formulas in this roundup. If you want a higher SPF and lighter feel, switch to SPF 50 options like Blue Lizard or Coppertone.

How to Choose the Best Mineral Sunscreen for You

Mineral sunscreen is the right choice if you want immediate protection, gentle ingredients, or reef-safe sun care. The two FDA-recognized mineral filters are zinc oxide and titanium dioxide. They sit on top of the skin and physically scatter UV rays, which is why mineral SPFs start working the moment you apply them, unlike chemical formulas that need 15 to 20 minutes to activate.

For everyday face use, a mineral SPF 30 to 50 with broad spectrum coverage is sufficient for most skin types. If you are at higher altitudes, near equator, or have very fair skin, lean toward SPF 50. The Skin Cancer Foundation recommends SPF 30 as the minimum for daily use and reapplication every two hours during sun exposure.

Match the formula to your skin type and concern

Oily and acne-prone skin generally prefers lightweight fluids like CeraVe Invisible Mineral or ISDIN Eryfotona Actinica. Dry and mature skin loves richer formulations like Eucerin Sun Sensitive or Colorescience Face Shield Flex. Sensitive and rosacea-prone skin benefits most from EltaMD UV Skin Recovery or Cetaphil Sheer. Deeper skin tones should test tinted options or “no white cast” formulations to avoid the chalky look that has historically plagued mineral SPF, a frustration echoed repeatedly on Reddit’s SkincareAddiction forum.

Watch for true 100% mineral vs hybrid formulas

Many products marketed as “mineral sunscreen” in the US include chemical boosters like butyloctyl salicylate to reduce white cast and improve texture. If you want a true 100% mineral formula, the active ingredient list should show only zinc oxide and/or titanium dioxide. The Blue Lizard Sensitive, Badger Reef Safe, and Colorescience Face Shield Flex formulas are all genuinely 100% mineral, a distinction that matters for chemically sensitive users and concerned parents.

Check the water resistance rating honestly

The FDA allows water resistance claims at 40 or 80 minutes. If you are swimming, sweating heavily, or doing water sports, an 80-minute formula like Coppertone Sport, Thinksport, or Thinkbaby is the right pick. For daily commutes and errands, water resistance matters less. Reapply every two hours during sun exposure regardless of the rating.

Application technique matters more than brand

Most dermatologists recommend roughly a quarter teaspoon for the face and neck and a full shot glass for the body. Press the lotion into skin rather than rubbing it in circles, which reduces pilling and helps even out the cast. The Reddit skincare communities repeatedly emphasize that mineral SPF results depend heavily on application. Take an extra 30 seconds to work it in and the payoff is consistent coverage without the chalk.

EWG verification and reef-safe labels

The Environmental Working Group database rates thousands of sun care products for ingredient safety. Badger, Babo Botanicals, and Thinksport carry strong EWG reputations. Reef-safe claims vary by brand. Hawaii Act 104 prohibits oxybenzone and octinoxate, so any formula labeled Hawaii-compliant meets that bar. The Badger Protect Land + Sea certification is one of the more rigorous third-party seals available.

For more shopping strategy, our guide to Amazon Prime Day sunscreen deals walks through how to spot real discounts on premium mineral SPF.

Frequently Asked Questions

Our Final Verdict on the Best Mineral Sunscreens

After testing all fifteen formulas over months of daily wear, beach days, and one sunburn-free hiking trip, the top mineral sunscreen recommendation is Coppertone Sport Mineral SPF 50. It is the highest-rated option in the roundup, the easiest to apply for body coverage, and the most affordable path to reliable mineral protection for the whole family.

For face use, Cetaphil Sheer Mineral Face SPF 50 is the value play and CeraVe Invisible Mineral SPF 50 is the no-white-cast winner. Premium shoppers will love the ISDIN Eryfotona Actinica for daily repair and the Colorescience Face Shield Flex for a tinted, blue-light-defending base. Whatever you pick, the mineral sunscreen aisle in 2026 has reached a quality tipping point that older SPF loyalists will appreciate.

Stock up before peak UV season, pair your mineral SPF with a hat and shade breaks, and reapply every two hours. Your skin will thank you for years. If you are hunting bargains, browse our Amazon Prime Day sunscreen deals guide before you check out.