Inov-8 Arctic Claw 300 Trail Runner 100% Textile and Synthetic Imported Rubber sole For racing over extreme off-road terrain, excelling on ice and frozen ground. Phenomenal grip: Using more tungsten carbide spikes than ever before, maximum grip is guaranteed. Spikes carefully positioned to ensure grip throughout the gait cycle. Run effortlessly over any snow and ice with unique POWERFLOW midsole technology. POWERFLOW delivers 10% better shock absorption and 15% better energy return than standard midsoles. Run with protection and comfort: PROTEC-SHANK aligns with spikes underneath to protect foot's metatarsals, while still allowing for a flexible ride. Superior debris protection: The unique on-the-shoe gaiter hooks offer a more secure attachment system, which allows a race ultra gaiter to be secured directly to the shoe and defend against debris.