Inner and outer nylon shell with horizontal baffles that allow the adjustment of the 650 fill power insulation to move where the fill is needed the most. 2.02lbs SAVE SPACE & SHAVE WEIGHT with ultralight premium quality duck down filling - nature's best light insulator with the highest warmth-to-weight ratio to beat the cold outdoor winter weather. 0 Degree Sleeping Bag also available. STAY WARM & DRY as a result of water-resistant shell fabric and Hydrophobic 650FP duck down - the microscopic air clusters found in down feathers create "loft" that trap heat and keeps you warm in the sleeping bags for girls boys adults & kids alike. HIKE FARTHER with our LIGHTEST MUMMY SLEEPING BAG available for this quality & price. Summit any mountain or camp by the sea with this compact winter sleeping bag & have room for your favorite blanket, liner, goose filled pillow, and pad. LONG LASTING DURABILITY from ultralight water repellent 400T 20 D ripstop nylon fabric liner with two YKK zippers, wide shoulders, large footbox, snag-free Velcro, drawstring, horizontal baffles, & compression stuff sack case for storage included. HYKE & BYKE is a brand of outdoor gear that started small but has quickly made a big impression on outdoor enthusiasts across the world amongst men, women, and children alike. Our vision of providing maximum value for every person looking to go outdoors is possible through beating big brands at getting the best materials at low cost, and connecting with our customers.