The Ascent is ideal for a range of climates, conditions, and activities. Whether you're embarking on a long distance motorbike journey or a weekend hiking escape, the 750+ fill power down provides lightweight warmth while the Free Flow Zip System allows for increased airflow and ventilation on hot nights. With a focus on comfort and adaptability, the Ascent Sleeping Bag is a first-rate choice for a diverse range of adventures. Features RDS-certified, 750+ fillpower goose down with a non-PFC Ultra-Dry Down treatment to stay drier in damp conditions. Free-Flow Zip System offers excellent temperature regulation and multiple sleeping bag configurations. Thermally-efficient, more relaxed mummy fit, room in the hood to fit an Aeros pillow and the option to zip couple with a compatible Sea to Summit Women's bag to deliver space for two comes standard. Lightweight 20D recycled nylon shell with a non-PFC DWR finish to protect against wind and moisture and a 20D recycled nylon liner for greater comfort. Box baffle construction throughout with vertical baffles in the torso to minimize down shift and maximize the retention of warmth. Zips to select Sea to Summit Women's Sleeping bags. Sea to Summit Guarantee is offered for the Lifetime of this product. Specifications Ascent -1° Regular Ascent -1° Long Ascent -9° Regular Ascent -9° Long Max User Height 185cm 198cm 185cm 198cm Weight 782g 897g 1020g 1157g Fill Weight 300g 343g 540g 617g Compressed Volume 5.5L 6.4L 7.5L 8.0L Men's Temperature Rating (ISO Comfort) -1° -1° -9° -9° Women's Temperature Rating (ISO Limit) 3° 3° -2° -2°