The WARMEST boot ever made! The bunny boot is well known to those who work in cold climates or in cold storage plants. Available in limited sizes and quantities. The black boot is rated to -20 degrees. It features a air chamber between layers with an air valve to compensate for pressure and a felt liner built into the sole of the boot to isolate from the cold ground. These boots have not been made for three or four years now and are no longer being manufactured. A very hard to find product. Excellent condition.