The K2 Radical Pro inline skate takes the best features of race skates, longmount frames, carbon cuffs, TwinCam ILQ-9 Pro bearings and combines them with the best fit in the world, the patented K2 Softboot. New materials in the upper create even more support for the 110mm/100mm Hi-Lo frame that makes the K2 Radical Pro the fastest K2 inline skate on the market and the number one skate for speed junkies world-wide.