Overpass Mid CMI Boots are made of premium waterproof leather with abrasion resistant toe upper. These boots have breathable waterproof membrane with moisture wicking mesh lining. Features removable OrthoLite cushioning footbed, advanced comfort PU midsole, dual compound rubber, PU outsole, wolverine ContourWelt construction, and nylon shank. 400g Thinsulate ultra. ASTM F2413-11 I I/75 C/75 EH. Material: Leather, Rubber.