The Rab Ascent 900 is a warm sleeping bag that will meet your expectations during nights with negative temperatures. The hydrophobic down with a fill power of 650 Cuin will keep you warm and dry throughout the night, ensuring optimal recovery during your outing. You will benefit from Rab's expertise in down and a collaboration with NikWax® for the water-repellent outer fabric that will protect you from moisture. The mummy/sarcophagus shape allows for better thermal efficiency than a traditional sleeping bag. Additionally, the Ascent 900 features many highly relevant characteristics for high-altitude environments, such as snag-resistant outer material, an internal zip pocket, and drawcords in the down and hood. Wide mummy shape Joinable: yes Proportionally assigned differential cut Internal YKK® 3-coil zip pocket Wide foot area for enhanced comfort Full-length YKK 5-coil main zip with nocturnal puller Snag protection Right and left zips available Internal drawcord and hood Close-fitting neck baffle design Trapezoidal baffle chamber design Slanted foot box Compression sack Cotton storage sack Filled in Derbyshire, UK All Rab products are ethically designed and certified by the Responsible Down Standard Rab Ascent 900 - Sleeping bag - Men's