The therm a rest prolite women s mattress is the lightest most compact self inflating three season mattress available from therm a rest making it ideal for your next backpacking trek the women s version of the prolite offers you an added level of warmth for cold sleepers and as the size of the mattress is more suitable for a women s shape it means that you can keep the pack size and weight to a minimum too the prolite mattress now features therm a rest s new atmos foam which they have devised in