Sure, tubular tires are preferred for racing, but they aren't practical for everyday training or long century tours. Who wants to replace a glued tired by the side of the road and then hope it doesn't roll on the ride home' The Veloflex Corsa Clincher is an ideal clincher for those who want a high density casing for everyday training. The casing is Compressed PesCo corespun. This is layered on a Calicot puncture resistant belt. Calicot is the French translation of the English word calico. Basically, this refers to a style of weaving that's popular in India, whereby a layer of warp threads are woven one under and one over with a layer of weft. This gives the weave both strength and durability. The Calicot layer relies upon the tightness of the weave in order to achieve puncture resistance.To ensure both flexibility and an effective stiffness to weight ratio, the Corsa's 320TPI, corespun casing comes into play. Essentially, this means that the casing fibers are made by twisting staple cotton fibers around a central filament core, creating one yarn from multiple fibers. As a result, the material is between 40 and 50% stronger than typically spun materials, while retaining a similar, if not lower, overall weight. The beading is Kevlar thread so that the tire seats securely on the wheel.Veloflex uses as many naturally sourced materials as possible, and the Corsa clincher is no exception. The high density casing was coated in natural rubber, creating a supple and responsive tire that absorbs energy and rebounds from irregularities in the road surface again minimizing resistance. A herringbone pattern with a treadless center strip equates to grip in the corners and low rolling resistance in the straights.The Veloflex Corsa Clincher Tire is available in 700c x 23mm and 700c x 25mm. The tread and sidewall are Black.