Capix Helmet Multi Use Skateboard Snowboard Wakeboard Bike BMX Mountain Ski Open Box.. Hard-Shell Construction Hard-shell helmets are the staple of any rider. These tried and tested helmets are built by bonding an EPS liner to an injection moulded ABS shell. Through this process we combine the durability of the ABS or PC shell with the comfort of the EPS liner. The resulting product is strong and resistant to minor knock and scuffs. Note this is an open box closeout item and inside liners may vary. See Sizing scale below. Helmet sizing ....S/M-fits-52-57cm or 20.5-22.4inch L/XL-fits-56-60cm or 22-23.6 inch.