ASICS Men's GT-2160 Running Shoe Synthetic and mesh Rubber sole Space Trusstic System?: An advanced system that creates a pocket between the Trusstic System device and the midsole, allowing for greater midsole deformation and more efficient foot function Solyte? Midsole Material: Asics Proprietary cushioning material that provides an exceptionally lightweight midsole with excellent bounce-back and durability. Lighter than Asics' standard EVA and SpEVA. Reflectivity: 3M reflective material enhances visibility during low light hours