Saucony Men's Progrid Echelon 2 Running Shoe 100% Syntehtic and mesh Rubber sole Breathable mesh upper incorporates Arch-Lock for support Last: Standard Saucony Last for the classic Saucony fit; wide in the forefoot, narrow in the heel. Strobel technique. Cushioning material: Heel ProGrid. Weight: 12.1 oz. Technology: ProGrid Cushioning System, Dual Density SSL EVA, and SRC Impact Interfaces with HRC Strobel Board Additional Features: Comfortride sockliner, HRC forefoot cushioning, Neutral Arch-Lock, Hydrator collar lining Upper: Air Mesh Upper and lightweight support overlays. Widths M = Medium, W = Wide