100% Waterproof Triple-dipped Shells for Extra Tough, Extra Watertight Protection Recommended temperature rating to -1°FÂ Open Cell Foam footbed insoles provide comfort Shaft circumference is 16 inches and was taken from a size 9. There may be slight measurement variations based on size. An Alaskan staple in the commercial fishing industry with features that apply to a variety of industrial work settings, XTRATUF Legacy boots supply flexible, all-day comfort and the best protection against the broadest range of acids, corrosives, and contaminants. This 15-inch waterproof pull-on boot is made with a signature triple dipping technique, which creates a seamless barrier that is highly resistant to chemicals and contaminants. Our latex neoprene is ozone resistant, and is softer, lighter, and far more pliable than ordinary rubber. Cushioned insoles with arch support help fight fatigue and stress on the legs and back. This insulated version comes with built-in Polymeric Foam insulation to keep your feet warm even when its is -10F/-23C. Recommended half sizes order up.