Should You Wear Sunscreen Every Day? Yes, Here's Why

Yes. You should wear sunscreen every day, including on cloudy days, in winter, and when you are mostly indoors. The reason is UVA, the part of sunlight that drives skin aging and pigment. It is present all year, it passes through clouds, and it comes through most windows. You do not feel it, so there is no signal to tell you it is adding up. The easiest way to make it a habit is a sunscreen you do not mind wearing, which is what Swellies was built for: five ingredients, a lightweight gel, no white cast.

UVA does not take days off

Sunlight carries two kinds of ultraviolet. UVB is the one that burns. It peaks in summer and midday and drops off a lot in winter. UVA is the one that ages. It reaches deeper into the skin, it does not burn so you never feel it, and it stays far more consistent across seasons and across the day.

That is why "I only need it at the beach" does not hold up. The beach is a UVB problem. Everyday life is a UVA problem, and everyday life is where most of your hours are.

Do you need sunscreen on cloudy days?

Yes. Up to 80 percent of UV can pass through cloud cover, according to the Skin Cancer Foundation. A gray sky cuts the heat and the glare, which are the cues people use to decide whether to bother. It does much less to the UV. Overcast is one of the easiest days to get caught.

Do you need sunscreen indoors?

If you sit near a window, yes. Standard window glass blocks most UVB, which is why you will not burn at your desk. It lets a large share of UVA through.

Your car is the clearest example. A 2016 study measuring UVA through car windows found windshields blocked about 96 percent on average, but side windows averaged only about 71 percent, and some let through far more. The driver's side window is next to your face for every commute. If you drive most days, that exposure is real, and it is one-sided.

If you work in a room with no windows and do not go outside, you can skip it. Most people's days include a window seat, a commute, a walk to lunch, or an errand, and those add up.

Do you need sunscreen in winter?

Yes. UVB drops in winter, so burning is less likely, but UVA carries on at close to its usual level. Snow makes it worse, reflecting UV back up at you, and elevation adds more. If your winter includes mountains, read sunscreen for skiing and snowboarding and UV at altitude.

Check the UV index before you leave

The UV index runs from 1 to 11 and up. The World Health Organization recommends sun protection at 3 and above, and across most of the United States the index reaches 3 on a normal day for much of the year.

You do not need an app for it. There is a live reading at the top of this page, and every page on this site, showing the current UV index for wherever you are. Keep in mind it tells you about the sun, not the window. A low number is not a pass if you are sitting next to glass all day.

What daily sunscreen looks like

• Broad spectrum. This is the non-negotiable. The daily threat is UVA, and a sunscreen that only covers UVB does not help with it. Here is what broad spectrum has to earn.
• SPF 30 or higher is the usual daily recommendation. Past that, how much you apply matters more than the number.
• Enough of it. About a quarter teaspoon for your face, closer to half a teaspoon with your neck and ears. The easy version: two full lines along your index and middle fingers. Most people use a quarter to a half of that, and get far less protection than the label says.
• First thing, same place. Put it on in the morning as part of what you already do, before you are out the door. Reapply if you spend real time outside.

Why people skip it

Almost nobody skips daily sunscreen because they think it is a bad idea. They skip it because the product is annoying. It is greasy on the collar, white on the face, it smells like a pool deck, it pills under makeup, or it lives in a beach bag in the garage.

The people who wear sunscreen every day are not more disciplined. They found one that does not ask anything of them. That means a finish you forget about, no white cast, no fragrance, and a format that lives next to your toothbrush or in your bag. We built a whole morning around that in the sunscreen morning routine, and if you are wondering whether it is too early or too late to start, see when to start sunscreen.

Where Swellies fits

Swellies is a daily sunscreen first. One active, non-nano zinc oxide at 21 percent, covering UVA and UVB on its own. Broad Spectrum SPF 46, water resistant 40 minutes.

The other four ingredients are there so you keep wearing it. Coco Caprylate/Caprate carries it without grease, Dextrin Palmitate makes it a breathable gel, Polyhydroxystearic Acid keeps the zinc even so there is no white cast, and Iron Oxides add a sheer tint. No fragrance, no silicones, no preservatives. It comes in a 50ml airless pump that dispenses the same amount every time and fits in a pocket, a desk drawer, or a car door, which is where daily habits live.

Frequently asked questions

Should you wear sunscreen every day?

Yes. UVA, the part of sunlight that drives skin aging and pigment, is present year-round, passes through clouds, and comes through most windows. Because it does not burn, you do not notice it adding up. A broad spectrum sunscreen worn every morning covers that daily exposure.

Is it bad to wear sunscreen every day?

No. Daily sunscreen is the standard recommendation for everyday sun exposure. If a sunscreen bothers your skin, it is usually an ingredient like fragrance rather than daily use itself, so a short, fragrance-free formula is a good place to start.

Do you need sunscreen if you stay inside?

If you are near windows, yes. Window glass blocks most UVB but lets a large share of UVA through. Car side windows averaged about 71 percent UVA blocking in one study, compared with about 96 percent for windshields. If you are in a windowless room all day, you can skip it.

Do you need sunscreen on a cloudy day?

Yes. Up to 80 percent of UV can pass through clouds. Overcast skies reduce heat and glare, which makes it feel safe, but they do much less to the UV reaching your skin.

What SPF should I wear every day?

Broad spectrum SPF 30 or higher is the usual recommendation for daily wear. Applying enough matters more than a higher number: about a quarter teaspoon for the face, or two full lines along your index and middle fingers for the face and neck.

Does wearing sunscreen every day cause vitamin D deficiency?

Research has not shown that everyday sunscreen use causes vitamin D deficiency in most people. Real-world application is thinner than lab testing, and incidental sun exposure continues. If you are concerned about your vitamin D levels, a doctor can test them.

Do you need to reapply sunscreen if you are inside all day?

Generally no, if you are mostly away from windows. One morning application covers a typical indoor day. Reapply if you spend extended time outside, sweat, swim, or wipe your face.

Five ingredients. Built to wear every day, not just at the beach. Shop Swellies SPF 46 →