Marmot Helium Sleeping Bag - Long For three-season backpacking and camping, the simple Marmot Women's Helium has proven itself to be a dirt-tough, super warm sleeping bag. At two pounds, it's considered an ultralight bag, but astonishingly, it packs down to a size smaller than a loaf of bread. How's that for tiny! A side blocked below end of zipper keeps the down evenly distributed and a classic trapezoidal foot box creates more foot room while keeping tight and cozy. It's designed for women, so it's smaller in areas that women are generally smaller, with tough construction to last for years. Features: Temperature rating: 15 degrees F (-9 degrees C) Mummy shape Zipper option: LZ Shell material: Pertex Quantum N-090 Ripstop Lining: Pertex Quantum N-090 Taffeta Insulation: 900-Fill Goose Down Weight: 1 lb 13 oz/ 822 g Regular: 5"6" Smaller and shorter zipper Hood draw cord positioned for easy access Down filled draft tube eliminates cold leaks through the zipper Zipper guards repel biting zipper cords