1mm WETSOX Fin Sox Sock in original packaging. Only worn once. Avoid discomfort and even fin rash when you wear these 1mm Fin Sox Socks from WETSOX! These durable and stretchy socks feature a raised poly exterior as well as a 1mm neoprene core for warmth and protection. Fully protected flatlock seams make them withstand rugged wear and the ultra thin design ensures not extra bulk or needing to size up.