From the Centers for Disease Control:
The sun’s ultraviolet (UV) rays can damage your skin in as little as 15 minutes. The following can help to protect you from UV rays:
1. Shade - seek shade under an umbrella, tree, or other shelter
2. Clothing - when possible, wear long-sleeved shirts and long pants and skirts, as they can provide protection from UV rays.
3. Wear a Hat - wear a hat with a brim all the way around that shades your face, ears, and the back of your neck.
4. Wear Sunglasses - that block both UVA and UVB rays
5. Sunscreen - wear a broad spectrum sunscreen and reapply, as necessary.
Click on the link below for additional information.
*Source: https://www.cdc.gov/cancer/skin/basic_info/sun-safety.htm