The Muck Chore All-Conditions Steel Toe Hi Work Boot has all the standard Muck Boot features plus much more. This boot has a steel toe that meets ASTM F2413-05 standards. The stretch fit topline binding snugs the calf to keep warmth in and cold out. The upper is triple reinforced in the toe area and quadruple reinforced in the heel area. It has a 5mm CR flex-foam bootie with four-way stretch nylon which is 100% waterproof, lightweight and flexible.