3.5mm nylon II neoprene with glue and blind stitched seams for a superior water seal. Airprene side panels allow for water to drain while providing protection and warmth. Redesigned to provide a better fitting, warmer dive boot. 3.5mm nylon II neoprene Glue and blind stitched seams Superior water seal Airprene side panels allow for water to drain while providing protection and warmth Redesigned to provide a better fitting, warmer dive boot