The Prijon Touring Back Rest is best used an original replacement part for Prijon brand sea kayaks. Back support is made of foam, 13.5 by 7.5 inches, about 1.5 inches thick, with two metal tabs on the bottom edge and a seat strap loop on the back side. The metal tabs measure 6.75 inches outside edge on right to outside edge on left. This does not come with the Prijon Seat Back Padded Cover. PRIJONOUT