3mm Blue Termic Neoprene Finsock with Open Cell Interior

The finsock is comprised of three parts: the very strong elastic nylon exterior with anti-slippery nylon soles covers an open cell Heiwa (Japan) neoprene, which is protected by Blue Termic coating.  This coating not only adds comfort and 15% more insulation but also does not require soap or lubrication to put it on!