Updated for 2015 the peak of ultralight three season camp mattress performance the therm a rest large neoair xlite mattresses delivers more warmth and comfort per gram than any other three season air mattress available the patent pending technologies deliver that performance with minimal weight and less bulk than a one liter water bottle this year new softer fabrics bring better next to skin comfort and a boost in durability all with no added weight for the discerning alpinist thru hiker or wild