The Criterium SC S 25 is a handmade clincher tyre with the Challenge Corespun Cotton casing and a kevlar, folding bead. This tyre is intended for road racing. The SuperPoly casing is made from polyester and is designed for durability. The natural rubber used to make the tread provides superior grip. A layer of uniquely-crafted fabric with highly resistant properties sits between the casing and the tire to reduce the risk of punctures.