The d2 edge flex system this dual injected base features a soft rubberized compound along the outer edges of the saddle which allows flex through each pedal stroke while keeping the centre stiff for ultimate power transfer engineered with a snag less rear and nose platform the duster is constructed with a a mid density eva and designed for those who desire less pelvis rotation and more mobility ergonomically designed with a tip to tail peri canal for added comfort relief makes the duster a