Badger Company, Active Sunscreen Stick, SPF 35, Unscented, .65 oz (18.4 g)

The recommended amount of sunscreen to be applied is approximately one ounce, which is roughly equivalent to a shot glass full of sunscreen. This amount is considered sufficient to cover the entire body, providing adequate protection against harmful UV rays. It is essential to apply sunscreen liberally and evenly to ensure maximum effectiveness. Remember to pay extra attention to typically overlooked areas, such as the ears, scalp, back of the neck, and tops of the feet. Reapplication is crucial every two hours or after swimming or sweating excessively.

Chemical sunscreen contains organic compounds that absorb ultraviolet (UV) rays and convert them into heat, providing protection from the sun. These sunscreens typically contain ingredients like avobenzone, octinoxate, or oxybenzone. Physical sunscreen, on the other hand, relies on mineral actives like zinc oxide or titanium dioxide to physically block and scatter UV rays. It acts as a physical barrier on the skin's surface and reflects the sun's rays away from the skin. Chemical sunscreens are often preferred for their lightweight texture and ease of application, while physical sunscreens are known for being gentle on sensitive skin and providing immediate protection. It's worth noting that some sunscreens may contain a blend of both chemical and physical actives, combining the benefits of both types.

While it is true that some UVA rays can penetrate windows, the risk of prolonged sun exposure indoors is significantly lower compared to being outdoors. In most cases, the amount of incidental sun exposure you receive while indoors is not substantial enough to warrant the use of sunscreen. However, if you have specific circumstances such as sitting near a window for long periods of time or working in a place with intense artificial lighting, it may be beneficial to consider sunscreen with broad-spectrum protection. Additionally, incorporating other sun protection measures like using curtains, blinds, or window films can help further minimize UV exposure indoors.