I really like the Therm-a-rest Xtherm as a year round sleeping pad. So far I have not had any issues with durability or heat loss. The one problem I did have was the Regular was just too narrow. The Large is 25 inches wide which is close but I would have preferred something around 28 inches. Unfortunately, with the additional width came additional length of 77 inches. This of course add weight. I have spoken with Cascade Designs, and they have no plans to make a wide pad with a shorter length. There is a market for that type of design, someone just needs to start making them.