Don't confuse these beautiful seats with the Knock-off products sold at West. The Sport-a-Seat is made in the USA. The knock-offs are made in China.
The cover of the Sport-a-Seat is made with Sunbrella fabric, which will not fade, and a very sturdy zipper, which will not break easily if at all. The cover of the knock-off is an acryllic fabric that is likely to fade, and the zippers tend to break quite easily. The Sport-a-Seat uses a very high density polyurethane foam which maintains its cushion for years. You don't feel the frame through the foam, nor do you bottom out when you're seated. The knock-off has foam which is not very dense, and you tend to feel the frame as well as the surface on which you're seated after a short period of time depending on your weight. The frame of the Sport-a-Seat is incredibly sturdy, will hold up to 350# in each position and has contour bends for back comfort. There is a teflon protector attached to the hinge. Other seats of this type have no back contours, are definitely not very sturdy and have no protector attached to the hinge. The knock-offs are definetly less expensive than the Sport-a-Seat but you get what you pay for.
The Sport a Seat resembles a cushion that is 18" W, 40" L, and 3.25" H with a carrying handle. Heavy-duty with 6-position ratcheting hinges. The hinges are offset by two inches, which provides a long and short side. With the longer side down and the back adjusted to any of the 6 positions, the Sport a Seat is great for lounging. With the shorter side down and the back in the full upright position, the Sport a Seat offers independent back support while sitting on elevated surfaces. Your own weight on the bottom supports the back in all 6 positions.