Used Scubapro Hybrid Socks 2.5mmThe new Hybrid Sock is made of soft 2. 5mm neoprene with a textured sole that provides a bit of non slip protection for walking on wet boat decks. Featuring 100% high stretch Everflex Nylon outside and a plush interior lining for warmth and comfort, you can wear the Hybrid sock inside your dive boot for added warmth, as a liner inside a full foot fin, or by itself to walk around on a chilly boat deck. Whichever you choose, your feet will love you for