Another classic in the muck line-up, the muckmaster has served farmers and an array of outdoor workers for nearly a decade. With its tall rubber overlay, these rugged boots withstand sharp objects and are extremely warm, even standing in a wet field. Breathable airmesh lining. Calf-high extended rubber overlay. 2mm thermal foam under the foot bed. 5mm cr flex-foam. Eva contoured molded midsole. Ms-1 molded outsole. Comfort topline. Cr flex-foam adjusts to the unique contours of your foot to create a comfortable and stable foundation while resisting blisters and chafing