These 100% waterproof boots are made of heavy-duty, natural hand-crafted rubber and have a safety toe and steel midsole which meet or exceed ANSI Z41 PT99 M I/75 PR Specifications. A foam rubber bottom along with the 8mm wool felt midsole insulate the boots. Other features include a reinforced knee and belly patch, durable cotton/canvas lining, cushioning rubber sponge insole and a steel shank for arch support.