Sea to Summit Spark Pro Ultralight Down Sleeping Regular Bag, 30°C,

A professional-grade, ultralight down sleeping bag rated for 30 degrees Fahrenheit (-1 degree Celsius). Ideal for two-season backpacking, bikepacking, and touring. Features a contoured mummy shape and a hood with a zippered draft tube. 950+ fill power down insulation (Responsible Down Standard certified) with Ultra Dry Down treatment improves moisture responsiveness and maintains loft and performance. The durable, water-repellent (DWR) finish featherweight 10D nylon shell, free of PFCs (perfluorinated compounds), maintains high water resistance in the hood and footbox. A highly breathable 10D nylon liner enhances comfort. The FreeFlow Zip System features reliable, snag-free operation with YKK #5 side zippers and zipper plows, while minimizing added weight with YKK #3 footboxes and shoulder zippers. The 30-degree bag features a hybrid box baffle heating element in the torso and sewn-in baffles in the leg sections to reduce weight. The Sea to Summit warranty is provided for the lifetime of this product. The Sea to Summit Spark Pro ultralight down sleeping bag is a technical down bag designed for ultimate warmth in the lightest weight and smallest compressed size. It's perfect for backpacking, bikepacking, and touring. The mummy style protects against the cold and retains warmth. Our highest loft, 950+ fill power goose down insulation (Responsible Down Standard certified) is treated with our proprietary non-PFC Ultra Dry Down treatment, which improves moisture responsiveness and maintains loft and performance even in harsh conditions. The contoured mummy shape provides ample space for a natural sleeping position. The front draft collar fits snugly around the neck, and the shoulder area is oversized to retain warmth. The ultralight 10D nylon shell is DWR treated and perfluorinated compound-free, providing state-of-the-art packability and warmth. The 10D liner fabric keeps the bag breathable and comfortable. YKK #5 zippers are snag-free. The Free Flow Zip system ensures maximum breathability and the flexibility to open the bag flat like a quilt. Se The Sea to Summit Spark Pro ultralight down sleeping bag comes in two sizes: Regular (for users up to 6 feet tall) and Long (for users up to 6 feet 6 inches tall). It also has two temperature ratings: 30 degrees and 15 degrees. The baffle construction differs depending on the temperature rating and intended use: the 30-degree model uses a hybrid box baffle in the torso for warmth and sewn-together baffles in the leg area to reduce weight. The 15-degree model uses a full box baffle for maximum warmth. An Ultra-Sil compression bag and storage cube are included. Sea to Summit products are guaranteed against defects in materials and workmanship for the product's lifespan.