adidas Men's a3 Sequence 100% Nylon mesh Air mesh tongue for maximum ventilation adiPRENE inserts in the forefoot for pinpoint comfort Heel a3 for optimized energy use throughout foot strike adiWEAR outsole for best durability in high-wear areas with flex grooves for optimum forefoot flexibility Molded EVA insole for atomical comfort adiWEAR outsole for best durability in high-wear areas Flex grooves for optimum forefoot flexibility