* Hi-Fi helmet by Red Protection * Ultra Lightweight in molded polycarbonate shell* Aiband 270 fit system* Dryride Ultrawick linings* Vent Mesh* Quickclip Earpads* redphones audio compatible* Goggles Gasket Small = 55-57 cm Medium = 57-59 cm Large = 59-61 cm XL = 61-63 cm