The NeoAir Xtherm mattress is the flagship of the inflatable range of Thermarest. It is a premium mattress that offers an excellent ratio between weight (15 oz) and size (9×4 inches rolled) for Regular measures and 11×4.5 inches, and weighs 20 ounces for Large measures ,reduced while providing a very good insulation against cold soil (R Value of 5.7) and a level of comfort high thanks to its thickness. It is certainly expensive, but it is the kind of investment that we do not regret to wake up. Two little things to know anyway, it can be a little narrow for solid templates (but there is a rectangular version and wider XTherm Max) and it is a little noisy for those who have the hearing and / or the light sun (aluminized internal compartments “rustle” when moving at night).
you are gonna use it exclusively for every hike you will go on. It’s incredibly light and does not deflate quickly during use.
It swells quickly. But during the winter, it is recommended not to inflate it with your breath as the water vapor will condense to a liquid when it cools and stays inside. Therm-a-Rest provides a bag with this mattress that has a valve attached to it so that you can inflate the mattress by opening and closing the bag and the same thing to remove the deflation.