The new UNDER ARMOUR FAT TIRE MUDDLER, equipped with MICHELIN FAT TIRE Technical Soles, has a fully waterproof neoprene rubber upper and Charged Cushioning which absorbs impact & converts it into responsive quickness. The MICHELIN FAT TIRE in Outdoor Compound, inspired by MICHELIN Wild Gripper mountain bike tires, is able to provide excellent cross-slope traction and all-terrain performance.