Pearl iZUMi Octane SL II Cycling Shoe,Pearl iZUMi,Octane SL II" /> 100% Synthetic leather Synthetic sole OCTANE 1:1 Power Plate: Octane Grade Uni-Directional Carbon for feather-light stiffness P.R.O. 1:1 Anatomic Closure: follows the natural anatomic shape of the foot to eliminate hot spots and remove pressure from your instep P.R.O. 1:1 Heel Cup: with synthetic leather lining and external Carbon Power Band for maximum heel hold and power transfer Pearl Izumi one piece upper with laser technology provides a second skin fit, minimum weight and maximum comfort