The Rocky XRB Rubber boot is unlike any other rubber boot. Made for Xtreme outdoor play, the 7mm neoprene shaft features a 3D molded TPU overlay for extra durability. The Comfort Cushion on the interior heel provides stability and superior fit. 16" of height keeps you protected from water and the adjustable gusset makes these able to fit over any calf and bulky pant leg. An exterior rubber heel kick makes these boots easy to kick off. The vulcanized rubber construction is extra durable and is waterproof. For work in colder temps, these boots are lined with brand new Dri-Blaze® thermal insulation. This lining adds zero bulk but feels as if you are wearing a boot that has the equivalent of 800-100 grams of insulation. For a rubber boot that's ready for all Xtreme adventures, get the Rocky XRB 16" Rubber boot.