• Nylon
• 45-degree Fahrenheit (7-degree Celsius) ultralight down sleeping bag for warm weather backpacking, bike packing, and touring
• High-loft 850 fill power down insulation (Responsible Down Standard certified) with a non-PFC Ultra-Dry down treatment to improve reaction to moisture, retaining loft and performance
• Ultralight 10D shell with PFC-free DWR keeps the hood and footbox highly water resistant; breathable 10D nylon liner provides all-night comfort
• Contoured mummy shape provides adequate room for a natural sleeping position; YKK #5 zippers provide reliable, snag-free operation
• Baffle construction is sewn through for lighter weight; Sea to Summit Guarantee is offered for the Lifetime of this product