The Therm-a-Rest Evolite 8482 Mattress Regular is an excellent new mattress that is ultralight self-inflating & offers extreme loft & comfort & has been awarded with an Out Door Industry Award in the camping equipment category Therm-a-Rest have managed to achieve this incredibly lightweight & extremely comfortable mattress by combining their new Atmos 8482 Foam technology which is the lightest & most compressible foam on the market with an Airframe 8482 construction by alternating foam & air channels to reduce weight while amplifying loft The Evolite 8482 is an incredibly convenient & comfortable self-inflating mattress that allows just a few breaths to top off the mattress for optimal firmness & boasts being the best ultralight self-inflating mattress for loft & comfort making it a fantastic choice for ultralight backpackers who want the most comfort per gram