MEN'S OPENWATER CORE GLOVES The Core Gloves incorporate 2 mm thick neoprene and its pattern is optimized for elasticity, creating better thermal insulation so that you can swim the coldest waters in comfort. MATERIALS They are made with 2 mm thick neoprene, along with a highly elastic inner lining for a better fit.   PATTERN The extra-long pattern allows the gloves to overlap the wetsuit for better insulation.