Features of the NRS Men's Comm-3 Wetshoe 3-mm Neoprene Upper and a 5-mm neoprene insole make this paddle shoe warm and comfortable Flexible rubber sole offers High-traction support and protection from rocks and other sharp, pointy objects Gusseted YKK zipper makes them easy to get on and off Back neoprene panel color-coded by size Offers OutFitters easy identification of size when handing out shoes to customers on a commercial raft trip