High quality closed cell neoprene for maximum longevity. Only black Lycra coating guarantees maximum comfort as well as maximum durability. The adjustment elements are provided with markings to be able to set and replicate your individual foot size in a flash. Comes with 4 screws (M7 x 28mm), 2 metal top washers, 2 plastic top washers + 2 anti-twist plastic bottom inserts to fit with any kind of board specific attachment: 1. Boards equipped with single-screw plugs: just use 2 of the 4 screws 2. Boards equipped with double-screw plugs: remove all plastic washers and use metal washers with all 4 screws NEW - Completely revised and unique design: + 20% less weight + Significantly reduced elongation for direct connection and to avoid slipping in too far with risk of injury + Improved preforming for quick and easy assembly.