Utilizing HL-ElixR Micro-a synthetic insulation that uses a unique blend of three fibers for maximum warmth, soft feel and high loft-the Ultra Elite 30 is an ultralight ultra-cozy sleeping bag with a host of functional features to keep you snoozing as smoothly under the stars as in your home's bed. Highly compressible, this bag has an anatomical wrap-around foot box, 3D hood construction, internal stash pocket and all the unique features that makes Marmot sleeping bags so functional and intuitive for your adventure out.