Sunscreen is a regulated over-the-counter drug, so the important words on the label mean the same thing on every bottle. SPF is a tested number for how well it blocks the rays that burn you. "Broad spectrum" means it also covers the rays that age your skin. "Water resistant" comes with a tested number of minutes. Learn those three and you can read any sunscreen on the shelf.

Signature SELECT Sport Sunscreen Lotion SPF 50

What SPF Measures

SPF stands for Sun Protection Factor, and it measures one thing: protection from UVB, the rays that cause sunburn. In a lab, it's how much longer skin takes to redden with the product on. It says nothing about the other band of rays.

The number rises faster than the protection does.

The step from 15 to 30 is significant. The step from 30 to 50 is about one percentage point, and past 50 the gains are small enough that the FDA has proposed capping the labeled number at "SPF 50+." The American Academy of Dermatology recommends SPF 30 or higher as the floor. A correctly applied SPF 30 beats a thin coat of SPF 100.

SPF 30 does not mean 30 times longer in the sun. The lab number assumes a full dose that almost nobody applies, and sweat, water, and time all wear the film down. Reapplying protects you more than a higher number does.

"Broad Spectrum" Covers UVA

Sunlight reaches your skin as two kinds of ultraviolet. UVB burns, and it's what the SPF number covers. UVA goes deeper, drives wrinkles and sunspots, and adds to skin-cancer risk. SPF alone tells you nothing about UVA. "Broad spectrum" is the label term that certifies the sunscreen covers both.

To print "Broad Spectrum," a product has to pass a standardized FDA lab test proving it protects across the UVA range in proportion to its SPF. A high SPF with no broad-spectrum label guards against burning while leaving UVA largely unaddressed.

This is also where the label's one health claim lives. The FDA allows a single positive statement, and only on products that are both broad spectrum and SPF 15 or higher: used as directed with other sun measures, they "reduce the risk of skin cancer and early skin aging, in addition to helping prevent sunburn." That wording belongs to the FDA-required label. A product that isn't broad spectrum, or is under SPF 15, has to carry a warning box instead, saying it's been shown only to help prevent sunburn. That alert box is itself a signal you can look for.

Mineral vs. Chemical: Read the Active Ingredients

The only reliable way to tell mineral from chemical is the Active Ingredients line on the Drug Facts panel. The front of the bottle often won't say.

A mineral sunscreen, also called physical, uses zinc oxide, titanium dioxide, or both. A chemical sunscreen uses filters like avobenzone, homosalate, octisalate, or octocrylene. Both types protect to the same FDA SPF and broad-spectrum standards. What differs is feel. Mineral formulas are more likely to leave a white cast and can feel thicker, and the AAD points people with sensitive skin toward them. Chemical formulas usually rub in clear and spread more easily. But the best sunscreen is one that you feel comfortable in and will regularly reapply.

The sunscreens on Safeway's shelf in the Signature Select sport line are chemical formulas. The SPF 50 lotion, for example, lists avobenzone, homosalate, and octocrylene on its panel. If you want mineral, that's the panel to check: look for zinc oxide or titanium dioxide as the active.

"Water Resistant" Comes With a Number

No sunscreen is waterproof. The FDA banned the words "waterproof," "sweatproof," and "sunblock" because they all overstate what sunscreen can do. The only water claim allowed is "Water Resistant," and it has to state a time: 40 minutes or 80 minutes.

That time is how long the product keeps its labeled SPF while your skin is wet, measured in a lab through set soak cycles. It is not a promise that you're covered for 40 or 80 minutes and then reapply. It's the outer limit of protection in water before reapplying becomes mandatory.

Reapply at least every two hours in the sun. Reapply right after swimming, heavy sweating, or toweling off, even with an 80-minute water-resistant product, because that's when the film comes off.

Lotion, Spray, or Stick

Format changes how easily you get enough product on, and most people apply far less than the tested dose. That dose for a whole adult body is about one ounce, a shot glass full, and most people use a quarter to a half of it.

Lotion lets you see the coverage, so it's easiest to lay down the full amount and not miss spots.

Signature SELECT Sport Sunscreen Continuous Spray SPF 50

A continuous spray is convenient for reapplying and for squirming kids, but it's hard to know you've laid down enough, and wind blows it off target. Spray until the skin glistens, then rub it in, and do a second pass. Don't spray near the face. Spray into your hands and apply it there. Many sprays are flammable until dry, so keep them away from flame. One reviewer of the Signature Select sport spray, headed "Great sunscreen," writes it "goes on smoothly and isn't greasy."

A stick is good for the face, ears, and lips, and for touch-ups without runoff, but it's too small for whole-body coverage.

The Words on the Front

Most front-of-bottle words aren't FDA terms. They point you to something on the Drug Facts panel.

"Sport" isn't a defined term. In practice it pairs a water-resistant claim, usually 80 minutes, with a lighter formula meant to survive sweat. Read the water-resistance minutes as sport isn't a standard.

"Sensitive" isn't regulated either. It usually signals a mineral formula and often "fragrance-free." Confirm on the active ingredients.

"Mineral" is reliable only when the actives are zinc oxide or titanium dioxide, so it points you back to the panel. "Tinted" means added iron oxides give a slight color that cancels the white cast of a mineral formula. It's a cosmetic feature, not a protection grade.

"Kids" and "baby" are not a separate protection category. The same SPF, broad-spectrum, and water-resistance rules apply. The Signature Select kids spray, for one, carries the same filter set as the adult sport spray. For infants under six months, the FDA and AAD advise shade and clothing first, rather than sunscreen. One reviewer of the kids spray, headed "Easy to use," writes: "Nice spray makes applying easy. Not too oily."

Signature SELECT Kids Sunscreen Continuous Spray SPF 50

"Reef-safe" and "reef-friendly" are not FDA terms. No federal standard defines them, and no one tests or verifies them. They usually mean the product leaves out oxybenzone and octinoxate, two filters that some studies and state sales laws have flagged for coral. Several Signature Select sport sunscreens state "oxybenzone & octinoxate free" on the label, which is a factual statement of what's not in the bottle. Treat "reef-safe" as a marketing choice, not a tested claim as the research behind it hasn't really turned out to be true. Follow up studies have not showed the toxicity to coral reefs that the original paper claimed.

Buying It at Safeway

Start with the two words that carry protection: look for "Broad Spectrum" and SPF 30 or higher. Then pick the water-resistance minutes and the format that fits how you'll use it. Lotion for the base coat, spray for reapplying and for kids, stick for the face.

Safeway's own store brand, Signature Select, covers the sport range in lotion and spray, at SPF 30, 50, and higher. The dry-touch line goes up to SPF 70, though SPF 70 adds almost no UVB protection past SPF 50.

Signature SELECT Ultra Dry Touch Sunscreen Lotion SPF 70

For a burn you didn't prevent, the aisle also stocks an aloe vera gel with lidocaine. It soothes a sunburn. It does not protect against one. It's an after-sun product with no SPF, so don't mistake it for sunscreen. One reviewer of it, headed "Sun, you don't scare me!," writes it "really works well and is very comforting."

Signature SELECT Aloe Vera Gel with Lidocaine

Availability and formats vary by store. Check your Safeway's shelf or the app for what's in stock.

Common Questions

Is a higher SPF always better?

Not by much past SPF 30. SPF 30 blocks about 97% of UVB, SPF 50 about 98%, and SPF 100 about 99%. The AAD recommends SPF 30 or higher. Applying enough and reapplying matters far more than the number.

What does "broad spectrum" mean, and do I need it?

Broad spectrum means the sunscreen protects against UVA rays, which age the skin and add to cancer risk, as well as the UVB rays that burn. SPF alone only covers UVB, so yes, look for it. It's a tested FDA claim, not marketing.

Is mineral sunscreen better than chemical?

Neither protects better; both meet the same FDA SPF and broad-spectrum standards. Mineral formulas, made with zinc oxide or titanium dioxide, are more likely to leave a white cast and are often chosen for sensitive skin. Chemical formulas usually rub in clear. The active ingredients on the Drug Facts panel are the only reliable way to tell them apart.

How often should I reapply sunscreen?

At least every two hours in the sun, and right after swimming, heavy sweating, or toweling off. That holds even for a water-resistant product, because that's when the film comes off.

What does "water resistant 80 minutes" mean?

It's the tested time the sunscreen keeps its labeled SPF while your skin is wet, measured in a lab. It is not a promise you're covered for 80 minutes and can then stop. No sunscreen is waterproof; the FDA banned that word.

Does "reef-safe" mean anything official?

No. It isn't an FDA term, and no federal standard defines or tests it. It usually means the product leaves out oxybenzone and octinoxate. Some sunscreens state "oxybenzone & octinoxate free," which is a factual note about the ingredients. Treat "reef-safe" itself as a marketing claim.