Walls Men's Zero-Zone Big Duck Insulated Coverall 100% Cotton Imported Machine Wash Walls muscle back technology uses a large band of elastic across the back to increase your range of movement, elastic inserts at back waist Walls dry iq water repellent finish, double knee patches with an additional waterproof barrier for more protection and strength Zippered chest pockets, front swing pockets with additional pass through, back patch pockets - left pocket has a concealed zipper for added security Single needle diamond-quilted lining with four ounce polyester insulation Utility pocket on right leg and twisted hammer loop on left side