gul neoprene power sock 4mmA neoprene sock for those who want something more flexible than a neoprene shoe. A thin neoprene sock made of warming Dura Flex neoprene. A grip pattern provides a good grip. It can be worn barefoot or over a drysuit instead of neoprene shoes. If you choose to wear it over the drysuit, remember to get a larger size than you would in regular shoes. Specifications 4mm DURA FLEX neoprene Flat seam construction Titanium2 liner that reflects the heat back