The buff helmet liner an adult sized tubular designed for use with protective headgear and cycle helmets at 275cm long it is less bulky so combined with superior moisture management performance it means improved comfort for you designed to fit heads 53 ndash 62cm in diameter wear it as headband with or without protective headgear buff helmet liner features made with 100 fastwick extra plus for superb wicking performance this knitted polyester fabric has a special construction t