Yes, You Still Need Sun Protection in Winter

UV intensity does drop in winter at most latitudes, but it doesn't disappear — and UVA, the wavelength most associated with photosensitivity reactions and skin aging, is far less seasonal than UVB. Health authorities routinely remind people that sunscreen matters "even on cloudy days and during the winter months," and clothing coverage follows the same logic: fabric doesn't know what season it is.

Where winter sun exposure actually happens

• Snow reflects UV upward — skiing, sledding, or just walking in bright snow can mean more total exposure than a cloudy summer day.
• Car windows block UVB, not all UVA. A regular winter commute with sun on one side of the face is a slow, easy-to-miss source.
• Windows at home or work do the same thing — a sunny desk by a window is year-round exposure, not a summer-only risk.

Layering coverage into cold-weather clothing

The fix isn't wearing summer UPF gear under a coat — it's picking the one or two exposed areas winter clothing doesn't already cover. Hands on a steering wheel, a face near a bright window, or forearms under a rolled-up sleeve are the usual gaps. A thin UPF base layer or arm sleeves work fine under winter clothes since they're built to be breathable, not warm on their own.