Kask K.10 Dieci Helmet Handmade in Italy - crafted with the worlds finest materials and hours of pain staking focus and detailing Through body ventilation- large oversized ventilation provides tremendous heat dissipation while maintaining excellent aerodynamics Eco leather strap- the chin strap is 100% eco-leather which prevents skin irritation while increasing comfort Octo fit system - the Kask octo-fit adjustment system allows the rider to customize the fit for their comfort CPSC Certified - all Kask helmets are CPSC Certified, which means they meet and exceed all US safety standards for bicycle helmets