Brightwood Hat - Lindberg's thinner hat offers optimal UV protection and fits perfectly even under the bike helmet!Protect yourself from the sun with the Lindberg Brightwood Hat, a thin and soft hat designed for extra protection with sun protection factor (UPF) 30+. The ideal solution when the weather feels milder, but you still want protection over your head. Plus, it's perfect to wear under your bike helmet for additional comfort and protection.