Reapplying Sunscreen: Does It Matter Indoors?

Many people apply sunscreen in the morning and never think about it again. But how often you reapply depends on how much time you spend outside and near windows.

Outdoors

Reapply about every two hours, and more often if you sweat or towel dry. Sweat, water and friction all remove sunscreen.

Indoors

UVA rays can pass through glass, especially near a window for long periods. If you sit by a sunny window or drive often, your face may still receive UV exposure.

Practical tips

• Keep a sunscreen in your bag or car
• Use a formula that is easy to reapply over makeup, such as a spray or a light gel
• Sit away from direct sun where possible

Options for reapplication

Our La Roche-Posay Anthelios Invisible Sun Protection Spray is designed for easy top-ups on face and body. Check the label for the exact SPF before you buy.

This is general guidance, not medical advice.