The One Bag, our patented 3-in-1 sleep system, can be customized for comfort in any conditions. Style:Total Weight: reg - 5 lbs. (2262 g) / long - 5 lbs. 13 oz (2623 g) Temp Rating: 15°F, 30°F, 50°F Stuffsack Size: 11" x 20" (27.9 cm x 50.8 cm) shell: 50D ciré polyester taffeta comfort lining: 100% polyester insulation: 30% recycled polyester cut-staple insulation. Top layer features 50-degree-rated Heatseeker™ Eco synthetic insulation for versatile use in warmer weather Mid layer features 30-degree-rated Heatseeker™ Eco synthetic insulation for cool nights in the outdoors The two layers can be paired to get a 15-degree bag for maximum versatility Zippers open from the bottom to allow for extra ventilation.