Vittoria's Corespun K casing is reserved for Vittoria's highest class of racing tires. By alternating polycotton and Kevlar threads in a 5-to-1 ratio, the 290-thread-per-inch casing is ultra supple for excellent comfort even at high inflation pressures. Plus, the Kevlar offers top-notch cut and puncture protection while the handmade construction allows each thread to act independently for exceptional feel and traction.