neoprene 4mm Terraprene neoprene deck and tunnel Stretches easily and fits drum tight, shock cord rand, pre curved deck Infinity coating at front and side deck edges, 2mm Extend material with 4-way stretch Superspan tunnel Rubberized inner deck coating, fixed tunnel adjustment Nylon webbing with rubber grab loop NRS Drylander Shock Cord Sprayskirt - The NRS Drylander Shock Cord Sprayskirt is patterned to stretch easily and fit drum-tight on today's kayak designs. A rubberized inner deck coating grips the kayak combing from the inside, resisting slippage, while the tough 4-mm neoprene surface holds well under pressure.