The next generation of self-inflating mattresses is here. The Evolite Sleeping Mat from Therm-a-rest blends the convenience of self-inflation with the compact comfort of air.Alternating channels of air and Atmos foam has drastically reduced weight and amplified the loft of this sleeping mat, it still boasts excellent self-inflation requiring no more than a few optional extra breaths to reach the firmness you desire. Outdoor comfort has never been this good or this convenient.