A fan favorite among backcountry campers, the NeoAir® XLite NXT Sleeping Mat is the most advanced, all-season, ultralight, air camping mat there is. Termarest pays exceptional attention to detail; every milligram of this mat counts for comfort and ease of use.This mat is Thermarest's latest model revision, which solidifies the legacy of its predecessor with additional warmth and comfort without weight gain. Triangular Core Matrix? combined with ThermaCapture? offers the best warmth-to-weight and pack-size ratio of any air sleeping mat construction. This compact mat boasts a 4.5 R-value, for year-round warmth. Furthermore, the high-performance WingLock valve, allows the mat to inflate quickly.Thermarest's take on sustainability is to build once-in-a-lifetime purchases, so confident in their mat's quality and durability Thermarest offers a limited lifetime warranty.  NeoAir® XLite™ NXT Sleeping Mat | Sleeping Mats | George Fisher