If you prefer this style of cycle helmet, we hope these cool & funky designs will excite your taste buds.. ... Hardnut Z street helmets are made from high impact ABS outer shells with EPS liners & come with 12 vents to help keep your bonce cool. They are fitted with removable, washable padding. There is a spare set of different thickness padding included with each one. We have also added a dial-fit system to all of our helmets to make sure you get a proper & very comfortable fit.