A time tested last refined over the years produces an optimal fit; It's designed to work synergistically with the reinforced top arm of the sensifit, holding your foot comfortably in place, especially when you’re headed downhill The advanced chassis, surrounded by foam cushioning for comfort, connects directly to the sole to stabilize your heel Two different types of rubber are strategically placed on the sole, resulting in a more intense grip; a special patterned area on the heel grabs terrain more aggressively, giving you more control when you're moving along at a healthy clip Salomon 2 year limited warranty