5mm neoprene upper and insole keep feet toasty in cold waters Durable, high-traction rubber sole for support and traction Gusset-backed YKK zipper for easy on and off Back neoprene panel color-coded by size Whole sizes only The NRS Comm-5 Wetshoe - The NRS Comm-5 Wetshoe is constructed with 5mm thick neoprene for maximum insulation and delivers just as much support and comfort as the best-selling Comm-3. They keep your feet toasty in cold waters and provide the comfort and support needed for rocky river banks.