The therm a rest apogee quilt is part of the therm a rest quilt range which couples up with your therm a rest mattress so you can customise your own sleep system to suit your adventure the apogee delivers reliable warmth at a weight and size that s great for backpacking yet has the comfort and carefree durability for frequent use anywhere it is recommended to be used in temperatures ranging from 10 c 4 c and it achieves is excellent temperature regulation by combining an eraloft synthetic insula