Therma Rest is a very popular brand. The xlite is R 3.2, the xtherm is R 5.7 and much noiser. Either weighs about 1 lb. You have to decide on the 20" or the 25". The 25" is also a bit longer. Below freezing most hikers will also put a closed cell foam pad under the air mattress. Therma rest also makes a nice little battery powered air pump for blowing up their air mattresses, 3 oz. If you stay above 40* the xlite should work for you.