Choose Protection for Exposure

Read three useful label details

For outdoor activity, look for broad-spectrum protection, SPF 30 or higher and water resistance when you expect to sweat or enter water. Broad-spectrum means the sunscreen protects against both UVA and UVB radiation under the relevant testing rules. SPF mainly describes protection against sunburn-producing radiation in a laboratory test. It is not a timer telling you how much longer you can safely stay outside.

Water resistance has a time limit. In the United States, labels identify 40 or 80 minutes of tested protection while swimming or sweating. Other markets may use different wording, so read the actual instructions on the product you buy. “Sport” alone is not a substitute for those details, and no sunscreen is completely waterproof.

Use enough, and cover the gaps

Apply sunscreen before heading into the sun, following the label; many products direct application 15 minutes beforehand. For an average adult, about one ounce is commonly recommended to cover the exposed body when much of it is uncovered. The amount needed changes with body size and clothing coverage. The important point is an even, generous layer, not a barely visible dab stretched across several areas.

Give the ears, neck, shoulders, hands and exposed tops of the feet deliberate attention. Protect lips with an SPF lip product, and remember the hairline or thinning areas of the scalp. Clothing is often the easiest way to cover awkward areas. Avoid spraying sunscreen directly onto the face or inhaling it; follow aerosol safety directions and apply facial product with your hands where the label allows.

Reapply at least every two hours outdoors, after towel drying and according to the product’s swimming or sweating instructions. If a label specifies 80 minutes of water resistance, do not wait two hours after continuous swimming. Set a reminder if useful, but also respond to what you are doing rather than relying on the clock alone.

For hiking: build in practical coverage

Long trail days make reapplication and clothing especially valuable. Altitude, an exposed ridge and reflection from snow can change your exposure. Check a local UV forecast and route conditions, not just the temperature. A cool breeze may make sunshine feel pleasant without reducing its effect on your skin.

Choose a broad-brimmed hat where practical, UV-protective sunglasses and comfortable covering layers. UPF-rated clothing gives information about fabric protection, but fit, wear and garment instructions still matter. Arrange shade breaks when possible and consider moving strenuous exposed sections away from the strongest part of the day. Neither shade nor clothing removes every source of UV exposure, so combine measures.

For surfing: expect water and friction

Choose a water-resistant sunscreen and apply it before entering the water. A rash guard or suitable surf clothing can reduce the area you need to cover, while still leaving the face, ears, neck and hands to think about. A thick visible layer is not proof that an application has stayed intact throughout a session.

Reapply after the session, after towelling and within the product’s stated limits if you return to the water. Check local environmental rules for the destination you are visiting. Terms such as “reef-safe” do not have one universal testing definition and should not be treated as an environmental guarantee. Follow applicable restrictions and avoid leaving packaging or product waste on the beach.

Choose a texture you can live with

Mineral and organic-filter sunscreens can both provide useful protection when appropriately formulated and used as directed. Comfort, eye sting, skin sensitivity and the finished feel differ between products. Test a new sunscreen on a small area before a demanding day, particularly if you have reactive skin. A small trial can reveal irritation, but cannot rule out every later reaction.

If your sunscreen repeatedly stings or causes a rash, stop using that product and ask a pharmacist or clinician for advice. Certain medications and medical conditions increase sun sensitivity, so check your treatment information. No sunscreen blocks all UV radiation, and a higher SPF does not remove the need for reapplication or other protection.