On the AT last summer mine sprung a leak after 1400 miles. Thermarest replaced it but not quickly enough. I bought another at REI, so the one from the manufacturer is new in the box, haven’t even taken it out of the shipping box yet. It’s size large, weighing just 9 ounces but roomy for >6-footers like me at 77″ x 25″. I paid $260 at REI for the one used for the remaining 800 miles, but see it offered elsewhere as low as $200, so it’s a fair price IMHO, especially since I’m including shipping. This is an excellent product, took all of the abuse of the AT with just the one issue, a warranty defect at the valve that Thermarest stood behind.