The Kifaru Doobie is designed to replace the USGI poncho liner and are MUCH warmer. They are also great as a sleeping bag liner or ground cloth. Our Apex insulation is continuous filament – so strong that no quilting is needed. Plus, it has a better “feel” and draping capabilities – no quilting, so there are no cold spots. Coupled with our water resistant RhinoSkin Shell, you get immediate warmth and protection. Best yet, the Doobie is very compressible due to the state of the art materials used. Same great stuff we use in our sleeping bags.