Professional's Choice Hock Ice BootsProfessional's Choice Hock Ice Boots Neoprene exterior insulates the frozen gel pockets keeping the boots colder longer Smooth nylon lining eliminates the potential for damaging tissue from exposing the skin directly to ice, while also preventing dirt, shavings, and debris from sticking to the inside of the boots Hook and loop straps with elastic allow for custom fit and keep the boots in place To activate, place boots in freezer until frozen Wet leg