I was skeptical a mat this light would actually self-inflate, but it puffed up in about five minutes with barely any help from me. Packs down smaller than my old pad too, which freed up room in my pack.
Slept on this for three nights above treeline and barely noticed the cold ground underneath. The self-inflating part actually works — I opened the valve, ate dinner, and it was basically ready. Packs down smaller than my old foam pad too.