An Alaskan staple in the commercial fishing industry, these boots will give you flexible, all-day comfort and the best protection against the broadest range of acids, corrosives, and contaminants. Each boot is made with our signature triple dipping technique, which creates a seamless barrier that is highly resistant to many organic and inorganic acids, 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. 100% Waterproof Approximately 5.15lbs Hand-layered construction adds flex and strength at critical stress points Open Cell Foam footbed insoles provide comfort Recommended temperature rating to -1°F Shaft circumference is 16 inches and was taken from a size 9. There may be slight measurement variations based on size. Slip-resistant non-marking outsole Triple-dipped Shells for Extra Tough, Extra Watertight Protection Viral Penetration Resistant per ASTM F1671 / F1671M - 13