Two types of rubber and a patterned heel area grab the ground, giving you more control in the wet and mud The reinforced SensiFit construction holds your foot comfortably in place, especially on those tough downhills Surrounded by foam cushioning for comfort, the Advanced Chassis connects directly to the sole to stabilize your heel GORE-TEX keeps your feet dry - from the outside as well as from the inside Advanced Chassis is a molded insert embedded in the outsole