Outdoor design: The lightweight neck protection helmet liner is designed to keep the heat and sun off your neck and ears. The material is soft and flexible, designed to keep you cool and comfortable. Sweat absorption: The helmet liner with sun shade is easy to wear. This cap is made to absorb sweat and cover your neck from the sun, keeping the sweat out of your eyes and providing sufficient helmet shade cover from the heat. Safe and durable, soft and breathable to wear, friendly to your skin, and drape around the back of your neck and ears. It is common for people to soak it in water for added cooling effect, while others put it on their head.