adidas Men's a3 Gigaride Running Shoe 100% Leather and synthetic Synthetic sole Specially designed for the under pronator, the patented a3 technology provides the responsive cushioning needed to prevent injury due to improper form Full forefoot a3 structure absorbs impact and structure for each step Molded EVA (Ethylene Vinyl Acetate) sockliner provides light weight comfy support for whole foot Structured midsole offers maximum stability and steady platform Exclusive adiWEAR carbon rubber compound in the outsole provides ultimate durability