Northwave sonic high shoecoverthe sonic shoe cover is a high performance garment made from chloroprene rubber a water repellent material thats also a good insulator they are easy to fit and remove thanks to their full length rear zip features made from chloroprene rubber for great insulation full rear zip with cam lock puller reversed reflective zip taped inside velcro closure on the bottom eyelet for easy slip ontechnologies chloroprene rubber this synthetic elastomer is composed of g