• 99 PROBLEMS BUT SWEAT AIN?T ONE: Our wicking helmet liner soaks up your sweat and keeps it out of your eyes. Recommended for athletes, heavy sweaters and guy who do real work. • DESIGNED TO BE WORN UNDER HELMETS & HARD HATS: Instead of sweating inside your helmet (I can smell that nastiness from here), sweat into our breathable skull cap helmet liner. Afterwards, throw it into the wash and watch it speed dry on its own. • Functional cooling: You'll feel cool as soon as you put this on,It's because our helmet head liner literally cools your noggin'with its moisture activated cooling fabric • Application: You can wear cycling helmet liner cap when you are cycling or riding motorcycle,you will feel very warm and practical.Under helmet hat is good choice for cycling,hiking,camping,climbing,fishing,running,football,baseball,skiing,skating,etc Specifications: Name: Cycling helmet liner Material: Polyester + Spandex Color: Black, Gray, White Size: 22*13cm/8.66""*5.12"".Free size and elastic Features: 1.Cycling beanie cap has windproof fabric keeps warm,and protects ear from frostbite;Thermal and breathable,warm keeping and comfortable 2.Dry fit skull cap is fashionable and attractive one-size fits all design for both men and women.Elastic fabric,Good applicability,cap under helmet is easy to carry 3.Wear our helmet liner cap on its own or under your helmet.Wear skull cap thermal as you ride,snowboard or ski.Wear helmet liner beanie as you run,work out or play football.Wear fleece helmet liner as you're doing laundry Cycling head cooling helmet liner is suitable for cycling, motorbiking,CS Air soft paintball outdoor sports,etc.Cooling helmet liner can be used under helmet which keep you warm in winter