I bought the large mat and am very happy with it. It self- inflated well. I left it for over 24 hours. I appreciated the response to my questions about the mat. Great customer service. I purchased a large dry sac from Sea to Summit. Now, I can just roll up the pad and don’t have to fold it in half. I like everything about the pad. I like the non-slip decals that will keep the pad and sleeping bag from separating during the night.

I can’t say enough about how wonderful this sleeping pad is. I use it regularly for both car camping AND short backpacking trips. People think I’m crazy because it’s pretty heavy, but a beautiful night sleep is worth every ounce! I’d much rather cut weight elsewhere than go without this pad. It IS easy to get back in the stuff sack. (Do one initial “rough” roll, then one tight roll!) The flip switch on the deflate valve is genius.

I'm highly suspicious of this mat. When collapsed it takes up less than half of the size of my old mat, when inflated, it's an inch thinner than my old mat, but somehow, it keeps me warmer and it offers more cushion than my old mat. It's an amazing product, although it seems to defy all common sense. How could the mat be this much better than my old mat, one that I researched obsessively?It provides so much cushion that, while I had to fully inflate my 4" thick mat to get enough cushioning, I actually had to let some air out of this 3" mat because is was too firm. See? Suspicious. I suspect they're using technology from the future.And that's before I even get to the simple valve design that makes deflating so much easier than my old self inflating mat. Popular ... MoreI'm highly suspicious of this mat. When collapsed it takes up less than half of the size of my old mat, when inflated, it's an inch thinner than my old mat, but somehow, it keeps me warmer and it offers more cushion than my old mat. It's an amazing product, although it seems to defy all common sense. How could the mat be this much better than my old mat, one that I researched obsessively?It provides so much cushion that, while I had to fully inflate my 4" thick mat to get enough cushioning, I actually had to let some air out of this 3" mat because is was too firm. See? Suspicious. I suspect they're using technology from the future.And that's before I even get to the simple valve design that makes deflating so much easier than my old self inflating mat. Popular Mechanics rated this mat its most well designed outdoor mat and I can't find any fault with that appraisal.A couple things to keep in mind: I use this for car camping. While it deflates down very small, it's likely a little too big for any serious backpacking. Also, on its first use it takes several hours to fully self inflate. Obviously, you can inflate it yourself, but if you're planning on letting it self inflate to save your breath, just keep that timeframe in mind.In short, this mat is so well designed and made with such quality, that it's made me start my search for new camping gear with Sea to Summit's website.