The liner is removable, therefore the cap part is machine-washable for hygiene purposes. Reflective Piping. Extra holes in the liner plus the two mesh panels on the outer mean added ventilation for coolness and comfort. Unique one-handed angled adjuster. The protective liner is removable, so the outer cap is fully washable for hygiene purposes. Terry towelling sweatband adds comfort and absorption for the wearer. EN812:2012 Fits 53cm to 63cm headsize.