Waterproof Cruiser pull-on boots are molded from lightweight EVA (ethylene-vinyl acetate) resin, without seams that leak or buckles that fail. Cruisers are tough enough to stand up to challenges such as rebar wire ties that can shred PVC boots. EVA provides shock absorption and insulates against cold, even at sub-zero temperatures. Billy Boots USA. 414-375-1995. www.billybootsusa.com