Lighter than an imaginary cloud (and far warmer), Marmot’s Helium 15-Degree Down Sleeping Bag is the perfect bag for long, chilly trips when added ounces can mean serious slowdowns. The Helium is part of Marmot’s Ultralight series, which isn’t quite as airy as the barely-there Ion, but it’s a lot more affordable and still a killer three-season bag for backpacking, camping, and alpine missions. Pertex Microlight and nylon ripstop fabrics keep the superlight 800-fill goose down from escaping, and Marmot’s Smooth-Curved baffle construction prevents the insulation from shifting around, so you’re not fighting cold spots as you drift off to sleep. The Helium also sports an anatomically designed footbox and drawcord hood to keep your extremities toasty, and it uses a dual-zipper construction to let you fold down the top of the bag to sit up and increase ventilation when the night is a little warmer than expected. This is a toasty warm sleeping bag in near new condition. I used it on a three week tea house trek to Everest Base Camp. All nights were spent indoors, on a mattress, while wearing a pair of dedicated sleeping clothes that were never hiked it. It hasn’t even seen the inside of a tent!!! Size Reg with a left zip. Marmot recommends this size for users up to 6ft. The hood fit snug while sleeping on my back, however users over perhaps 6’2 might want a little more length. The item “Marmot Helium 15F 800-Fill Down Sleeping Bag” is in sale since Wednesday, December 20, 2017. This item is in the category “Sporting Goods\Outdoor Sports\Camping & Hiking\Outdoor Sleeping Gear\Sleeping Bags”. The seller is “koyenj” and is located in Fond du Lac, Wisconsin. This item can be shipped to United States.