The Seamless Alpine Burrow Bag is made using Montbell's proprietary synthetic insulation, Exceloft. Exceloft offers advantages in wet or humid conditions that could potentially compromise a down sleeping bag. EXCELOFT is perfectly paired with our seamless construction, which reduces sewing holes where warm air can escape and create a more airtight sleeping bag. As a result, this simpler method of construction allows Exceloft to loft to its fullest potential, trapping more warm air and reducing the potential for cold spots. The interior features gathered quilts and elasticated stitching which hug and move with you as you sleep, keeping insulation close to the body and eliminating dead space without feeling restrictive. Weight:1.47kg Compressed size: Ø20 × 40 cm / 11 L Max user height: 6ft 6' / 198cm 30d Super Multi (multi-filament) polyester taffeta w/ water repellent finish EXCELOFT - 100% polyester Super Spiral Stretch System internally Adjustable Neck Baffle keeps warmth inside Hood Adjuster with draw cord for face hole adjustment Draft Tube (single) along the zipper shuts cold air out Insulated zipper flap prevents cold air from coming in Two-way right or left hand mating zipper (67 in / 170 cm) Auto locking zipper to limit zipper "slip" during the night Anti-snagging slider cover Triangle Gusset - reinforcement at the end of the zip Compression stuff sack included ISO tested: 34°F / 1°C (comfort) 23°F / -5°C (lower limit) Montbell Seemless Alpine Burrow Bag #2 Long Sleeping Bag - Sunflower