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.