The therm a rest prolite self inflating mattress is the lightest most compact self inflating mattress from therm a rest designed for 3 season backpackers climbers and trekkers the tapered shape and use of die cut foam means that this self inflating mattress offers warmth and comfort while being highly compressible limiting bulk and weight the poppy colour option is new for 2015 and features the new atmos foam which is exclusive to therm a rest it is a cleaner and more controlled manufacturing me