Cad designed, air flow technology, adjustable hearing system, forehead vents and goggles strap retainer. Anti-itch, sweat absorbing liner. Inner shell is made from shock absorbing eps for all safety standards. Soft metallic finish. Accepts uvex chinguard. Skating helmet vents: 14 air vents Weight: 330-345g Material:eps+pc shell Technology: in-mould Removable goggle lock strap