When it comes to innovative camping mattresses therm a rest have led the way since the 1970s the trail lite sleeping mattress uses expandable die cut foam to reduce weight and bulk making it ideal for long distance travelling it self inflates when the valve is opened which lets in air and causes the foam to expand the mattress rolls up small and comes with a stuff sack for easy packing it is made from light 75d textured polyester and has a streamlined shape