Lightweight and warm
Have used this mat a number of times so far. I see a lot of reviews saying that this mat is not true to its R rating but I have found the contrary. After using this mat a couple of times in under 10 degree weather with an inadequate sleeping bag, it was the only thing keeping me warm on those nights. It packs down incredibly small and it's super lightweight. I'm taking off a star because I always seem to have trouble deflating it and have to roll up twice to get all the air out before packing it away.