Winter Last - With a much wider & taller toebox than our traditional lasts, the Winter last allows the foot to maintain proper circulation even when thicker socks are worn. Our winter last is the standard for winter cycling footwear. OUTSOLE: Heavy duty Mountain V outsole by Vibram, 2 hole SPD compatible. UPPER: Ecco vegetable tan leather, Waterproof membrane liner & 3M Thinsulate lining in toe box. CLOSURE: Lacing system.