NRS Hypalon 2 in. D-ring Patch (6 in.) The NRS Canoe 2" D-Ring PVC Patch (Blue) has two layers of nylon webbing that secure the D-ring to a 840 denier 42-oz. neoprene base. A strip of neoprene covers the nylon, protecting it from UV and abrasions. Colored Pennel Orca is glued on top to complete the patch. 2" D-rings are stainless steel, and available in 6" patches.