Check the listing for details. 3x Helmet Liner Skull Cap Beanie Sweat Wicking Cycling Sport Quick-dry Hat Wrap. Color: Black, Condition: New with tags. Listed at 10.49 USD. Our cooling skull cap sweat wicking, lightweight, stretchy and breathable skull cap absorbs sweat and keeps it away from your eyes and forehead, quick cooling and drying, feel like second skin under your helmet. Suitable for people with a head circumference of 20”-23.6” (51-60cm). These skull hats can be worn by men and women for a bunch of different activities indoors or outdoors, it can be worn as a helmet liner under helmet & hard hat when you are mountain biking. You choose, it is a one size fits all: walking, hiking, jogging, running, workout, cross training, cycling, gym, tennis, dancing, basketball or whatever you could think of! Are you a construction worker? Increase your head comfort while putting our helmet liner under your helmet.