Extremely light, extremely compact, very comfortable mat that always fits back into the stuff sack.This is the single chamber design, so it isn't quite as thick or comfortable as the dual chamber design from Seas to Summit.However, I don't notice this at all after a day of walking/hiking and camping, when I'm tired. It works perfectly, weighs almost nothing, and packs down to an impossibly tiny roll which fits anywhere in a pack.Inflating takes about 30 seconds with the stuff sack acting as an inflation chamber. This is brilliant and uses physics as a mechanical advantage.This means less moisture from breath being blown into the inside of the mat, much faster inflation times, and... I don't mind sharing my mat with others, as they won't put their mouth on the inflation aperture.I've tried nearly all the other pad brands (Thermorest, Exped, etc.) - none come close to Sea to Summit on any metric except the R Value, which is negligible in all but the coldest environments (in my experience).