Altra Women's Intuition Running Shoe 100% Synthetic and mesh Rubber sole ZeroDrop Platform with Full Cushioning Midsole: 12mm; Dual Layer EVA with A-Bound Top Layer Upper: Quick Dry Air Mesh Liner: Full Length Seamless inner lining with Premium Drilex Collar Lining Comes with 2 removable insoles: 5mm Sculpted insole and 3mm Strengthen insole