Very good, light weight and comfortable - Sea to Summit Ether Light XT Insulated Sleeping Mat

With 10cm of thickness, a packed size of 12x28cm, at only 560g... I was well impressed with not only the level of comfort, but how little noise this mat actually makes when moving around on it. The sprung cell pattern makes a lot of sense to me, air and warmth are well distributed. The item feels very robust and well insulated. Just make sure to get a size large sleeping mat like this one, even if you're an average size guy!! If you go with size regular, you'll have a mat that's just barely long enough, but not wide enough - so there'll be no arm space, and sleeping sideways won't be quite as doable.