Utilizing HL-ElixR Micro&';s 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. ElixeR Micro a Unique Blend of 3 Fibers Provides Maximum Warmth, Compressibility, and Down Like Soft Feel Anatomical Wrap-Around Footbox Increases Insulation and Room for Your Feet, More Warmth and Comfort Full Length Locking YKK Two Way Zipper with Anti-Snag Slider reduces fabric snagging EN Tested 3D Hood Construction Internal Stash Pocket Snagless Insulated Draft Tube Lightweight nylon compression sack and mesh