The NRS Drylander Shock Cord is patterned to stretch easily and fit drum-tight on today's kayak designs. Rubberized inner deck coating grips the kayak coaming from the inside, resisting slippage. Tough 4 mm neoprene surface holds well under pressure. Infinity Coating on the front edge and sides gives great protection in high wear areas. 2 mm Extend(TM) material with four-way stretch Superspan tunnel gives a snug comfortable fit.