ASICS Women's GT-2140 Trail Running Shoe 100% Synthetic leather and synthetic fiber Rubber sole Space Trusstic System, an advanced system that creates a pocket between the Trusstic System device and the midsole, allows for greater midsole deformation and more efficient foot function Solyte midsole material is lighter than ASICS' standard EVA and SpEVA, combined with improved cushioning and durability ComforDry sockliner provides optimal cushioning performance in a cooler, drier, healthier environment