You wont find a better shoe for cleaning-up and keeping up with your Lab! The Muckster (TM) is 100 percent waterproof with a unique breathable Airmesh (TM) lining that keeps feet completely dry in a variety of climates and conditions. This lightweight, slip-on shoe features a multi-ribbed tread sole, an all-day comfortable footbed and a natural rubber overlay that will not cold-crack. Mucksters stretch to fit whole and half sizes. Unisex sizing.