Warm durable and comfortable, the Bogs Classic Ultra Mid waterproof boot is the ultimate outdoor shoe. Rubber upper and fabric shaft are insulated by a 7mm four-way stretch Neo-Tech insulation inner bootie. Able to withstand temperatures as low as -40 degrees Fahrenheit, these boots also features a non-slip, non-marking, self-cleaning outsole. DuraFresh antimicrobial properties help elongate the lifetime of your Bogs boots. Hand lasted rubber upper Nylon shaft Neo-Tech insulation Temperature rated to -40 degrees Fahrenheit Non-slip, non-marking outsole DuraFresh properties 10" shaft height 16" shaft circumference.