Inov-8 Women's Arctic Claw 300 Thermo-U Trail Runner 100% Synthetic Imported Rubber sole For racing over extreme off-road terrain, excelling on ice and frozen ground. Tungsten carbide spikes provide phenomenal grip. Powerflow midsole technology delivers 10% better shock absorption and 15% better energy return than standard midsoles. 8mm drop offers more underfoot to enhance comfort further. Full welded rand ensures 360-degree protection and ensures minor bumps won't end the day early.