Dual Density Helm Pad - 16 x 39 20mm - Large - Storm Gray/Black with Routed SD Logo406.4mm x 990.6mm x 20mmOur softest, most comfortable SeaDek pad yet! Your knees and back will thank you after a day on our Dual Density helm pad. Featuring an ultra-comfortable low-density 17mm foundation with our legendary standard 3mm brushed top layer for traction and durability, no boat is complete without this essential addition. All Dual Density Helm Pads utilize a robust 3M(TM) adhesive for an easy peel and stick application.