This is the Riffe 3.5mm 3D Dive Sock Neoprene Bootie Features: Neoprene Bonded w/ Nylon Flexible resistant tread Left and Right foot specific Whether on your boat or traversing the rocky shoreline heading out for a day of diving, RIFFE&';s fin socks offer exceptional comfort and protection. Double sided, ultra stretch, bonded Nylon 5 panel design ensures a form fit. Can be worn alone or with fins. Smooth interior for comfort and ease of entry and exit from sock. Extra durable outer material for wear. Flexible slip resistant tread. Sold in pairs.