Pearl iZUMi Women's SyncroFuel XC Trail Runner 100% Synthetic and mesh Rubber sole High Abrasion Seamless Race Upper with hybrid mesh combination: recycled mid-foot mesh and breathable forefoot mesh Half-length medial side syncro Stability Frame 1:1 Energy Foam cushions the foot upon impact and then returns energy back to the runner Ortholite sockliner for amazing step-in comfort and long-lasting cushioning SKYDEX heel crash pad