Pearl iZUMi Women's Race MTB Mountain Biking Shoe 100% Synthetic Synthetic sole SELECT 1:1 Power Plate: SELECT grade nylon and composite fiber plate for lightweight stiffness and durability 1:1 Anatomic Buckle Closure: closure follows the natural anatomic shape of the foot to eliminate hot spots and remove pressure from your instep SELECT 1:1 Heel Cup: with integrated Molded Power Band for benchmark heel hold and power transfer SELECT Insole provides excellent longitudinal and transverse arch support