Liquid Force 2013 Index Wakeboard Bindings N66 Chassis:Injection molded Nylon 6 plastic, 6 inch spread with 12% glass reinforcement.Impact EVA:Takes the shock of landings and displaces it from your foot.EVA foot-bed:3D molded foot-bed with ergonomic contours.Comfort Liner:Dual density tongue design and integrated J bars.Single Lace System:Lace system allows ease into and out of binding.Cuff Stretch Zone:Stretch zone that allows flex with no restrictions.