The words on a sunscreen bottle follow FDA rules, but they still confuse. Here is what each term guarantees, how long water resistance lasts, and what to check before you buy.
What to remember
- The American Academy of Dermatology recommends a sunscreen that is broad spectrum, SPF 30 or higher, and water resistant.
- SPF measures UVB protection only; the broad spectrum claim is what adds UVA protection.
- Water resistance lasts either 40 or 80 minutes, and no sunscreen stays on all day in the water.
- Only FDA-approved UV filters can be used in U.S. sunscreens; the FDA removed PABA and trolamine salicylate from its safe list in 2026.
- Most sunscreen recalls apply to specific lot numbers, so the code printed on the bottle is how you check whether yours is affected.
Standing in the sunscreen aisle with a kid tugging at your sleeve is no time to decode a label. Sunscreen is regulated as an over-the-counter drug by the FDA, which means the terms on the bottle follow federal rules for testing and labeling rather than marketing whim. Those rules do not always translate into plain English, though, so this glossary decodes the words you will actually see and what each one promises.
What SPF Numbers Really Mean
SPF (Sun Protection Factor). A measure of how well a sunscreen protects against UVB rays, the type most associated with sunburn. Applied correctly, SPF 30 lets about one-thirtieth of UVB rays reach the skin. The American Academy of Dermatology recommends choosing SPF 30 or higher.
UVB rays. The ultraviolet rays that mainly affect the surface of the skin. They cause sunburn and play the greatest role in causing skin cancers, including melanoma.
Application. How you put sunscreen on affects how well it works. A thin, patchy layer will not deliver the number on the bottle, so cover all skin that clothing does not cover.
Parent tip: SPF measures UVB protection only. For protection against UVA rays, look for the words “broad spectrum” on the front.
Broad Spectrum: UVA Versus UVB
Broad spectrum. A label claim meaning the sunscreen protects against both UVA and UVB rays. The AAD lists it as one of three things to look for, along with SPF 30 or higher and water resistance.
UVA rays. Ultraviolet rays that penetrate deeper into the skin. They contribute to premature skin aging and play a role in skin cancer formation. Sunlight contains roughly 500 times more UVA than UVB, which is why protection from both matters.
Photoaging. The wrinkles and age spots that come from too much unprotected UV exposure. Sunscreen helps prevent this damage on top of lowering skin cancer risk.
Everyday exposure. UV rays pass through clouds and windows, so exposure adds up on overcast days and indoors near glass. Sun protection works as a daily habit, not just a pool-day one.
Water Resistant Does Not Mean Waterproof
Water resistant. A claim that the product stays on wet or sweaty skin for a set period before you need to reapply. Not every sunscreen makes this claim, so check for the words if your kids will be in the water.
40 or 80 minutes. The two durations allowed for water resistance claims. An 80-minute product holds up longer than a 40-minute one, but neither is permission to skip reapplication.
Reapplication. Water, sweat and toweling all wear sunscreen down. Reapply after swimming, heavy sweating or drying off with a towel, and follow the time printed on the label.
Filters and Active Ingredients
Active ingredient. The UV filter that actually protects the skin. FDA rules require it to be listed on the label, and only filters the FDA has approved can be used in U.S. sunscreens.
UV filter. The regulator’s name for the same thing. Filters must pass testing for safety and effectiveness before a product can be marketed as a sunscreen.
GRASE. Short for “generally recognized as safe and effective.” An ingredient with this status can be used in sunscreens sold without a separate FDA premarket approval.
OTC Monograph M020. The FDA’s rulebook for sunscreens, finalized under the CARES Act. It sets out which active ingredients, doses, labeling requirements and testing standards apply.
Bemotrizinol. A new active ingredient the FDA added to its approved list in 2026, at concentrations up to 6 percent. It was the first new sunscreen active approved in two decades.
PABA and trolamine salicylate. Two older ingredients the FDA formally removed from its safe-and-effective list in 2026. If a bottle still lists either one, leave it on the shelf.
Oxybenzone. A common filter the FDA has been evaluating as it updates sunscreen rules. The agency has also proposed clearer labeling requirements for ingredients and usage instructions.
Mineral and chemical labels. Shorthand you may see in ads and store displays for different filter types. These words are not the regulated part of the label. The active ingredient list on the back is, and every filter named there must be FDA approved.
Expiration, Storage and Recalls
Stability and expiration. Sunscreen formulas must pass stability testing before they reach shelves, and an old bottle may not protect the way the label promises. If you cannot find a date on the packaging, or the product has been open for several summers, replace it.
Storage. Because sunscreen is an over-the-counter drug, it belongs with the rest of your medicines: up high, out of sight, caps closed. The same steps that keep pills away from toddlers work here, and our guide to storing medicine so kids can’t get into it covers them.
Lot number. A code printed on the packaging that identifies the specific batch. Most sunscreen recalls apply to individual manufacturing lots, so this code is how you find out whether your bottle is one of them.
Recall. When a sunscreen is pulled from the market, the notice lists the affected lot numbers. Check your bottles against the notice and follow the instructions, and see what to do when something you own is recalled for the full process.
How Much to Apply and What Else Helps
Coverage. Apply sunscreen to all skin not covered by clothing. Skin cancer does not discriminate by age, gender or skin tone, and an estimated one in five Americans will develop it in their lifetime.
Sun-protective clothing. Dermatologists recommend a lightweight long-sleeved shirt, pants, a wide-brimmed hat and sunglasses with UV protection alongside sunscreen. Sunscreen alone cannot fully protect a child.
UPF. Ultraviolet protection factor, a rating printed on some clothing that shows how the fabric handles UV. For more dependable coverage, choose clothes with a UPF number rather than guessing.
Shade. Cutting down direct sun exposure, especially midday, lowers the total dose of UV your child’s skin gets. Combine it with sunscreen and clothing rather than relying on any single step.
Reading the Label at the Store: A Quick Checklist
Run through this list before a bottle goes in the cart:
- Broad spectrum on the front.
- SPF 30 or higher.
- Water resistant, with a stated time of 40 or 80 minutes, if the day involves swimming or sports.
- An active ingredient list with only FDA-approved filters, and none the FDA has removed, such as PABA or trolamine salicylate.
- A legible lot number, so you can match the bottle against recall notices later.
- A date you can find and trust.
No single term on the label does the whole job. Broad spectrum coverage, SPF 30 or higher, water resistance matched to the day’s plans, and reapplication on schedule are what turn the words on a bottle into real protection for your kids.
Parents also ask
What SPF should I buy for my kids?
The American Academy of Dermatology recommends a broad-spectrum, water-resistant sunscreen with SPF 30 or higher. How you apply it matters as much as the number, so cover all skin not covered by clothing.
Does my child need sunscreen on a cloudy day?
Yes. UV rays pass through clouds and windows, so exposure adds up even when the sun is not out. Daily protection is the habit dermatologists recommend.
How long does water-resistant sunscreen last in the pool?
The label will state either 40 or 80 minutes of water resistance. After that time, or after toweling off, reapply.
How do I know if our sunscreen was recalled?
Check the lot number printed on the bottle against FDA recall notices, since most recalls affect specific manufacturing lots. Our guide to product recalls walks through what to do next.
This guide is general information for U.S. shoppers, not legal advice. Safety rules and store policies change, so follow the product’s instructions and labels and check official sources such as CPSC.gov, NHTSA.gov and FTC.gov.