The Road skin is 160 x 90 x 90mm in dimension. The universal fit is from 520mm (XS) - 640mm (XL) helmets. There is also a carry loop on the skin itself. To fit, position cover centrally on the helmet chin and lift and pull zip to close the cover. Neoprene will absorb minor knocks and save on abrasion and scratches; consequently the neoprene coating will degrade over time. To maintain in optimum condition, keep clean by washing in luke warm mild detergent and then dry throroughly in open air. Neoskin creases easily, but will return to its natural smooth state with use - including packaging creases.