Durable and breathable, the anti-bacterial synthetic upper reduces weight and increases comfort. When the day comes to give it your all, have the Hellion Elite by your side! This rubber compound has a hardness rating in the 40s on the Shore A scale - which means downright sticky and responsive. The softest compound is specifically chosen for grip and comfort - the ideal tool for the toughest days on the bike. DST 4.0 provides ultimate grip and pedal feel with unparalleled durability that outlasts other soft and sticky rubber compounds on the market. D3O Zone Technology D3O Zone Technology for impact resistance and comfort. D3O material is an extremely flexible and lightweight material that hardens upon impact and absorbs energy by realigning atoms on the outer surface. The heel and toe areas of the insole feature D3O's Lightweight Aero, as its high impact resistance is perfect for high-impact areas and provides a low-fatigue ride.