"OZTENT Redgum HOTSPOT XL Heated Sleeping Bag is the world's first non-electric heat adjustable sleeping bag. Adjust the warmth to your needs free of complication or electricity. Use the 6 HOTSPOT pockets and 3 included HOTSPOT pouches to adjust your sleeping bag comfort level to suit your needs. COMFORT PLUS interior includes cotton flannel inner fabric, collar and side baffles that add to your comfort and contribute to a great night's sleep. SIMPLE GLIDE zipper system with auto-locking sliders and anti-snag guards results in hassle-free operation where the zipper opens easily, but only when you want it to. Zip Connect allows you to join 2 sleeping bags together (left- and right-side models) to double the width. OZTENT Redgum HOTSPOT XL Heated Sleeping Bag features a ripstop cotton canvas outer shell and 2 layers of 150gsm Bonded T-Therm polyester fiber insulation. Chest and full-length side baffles promote insulation loft and prevent shifting. Inner storage pocket. Mfrs. 5-yr. warranty with product registration. Temperature range: 43F comfort; 34F lower limit; 9F extreme. 94.5""L x 39.4""W (including hood). Packed: 20.9""L x 17.7""W x 12.6""H. Hood size: 11.8"". Weight: 11.7 lbs.Manufacturer model #: OZ02SBREDXLA. Ripstop cotton canvas outer shell 2 layers of 150gsm Bonded T-Therm polyester fiber insulation 6 Hotspot pockets and 3 included HotSpot pouches Comfort Plus cotton flannel interior Auto-locking sliders and anti-snag guards Zip Connect allows you to join 2 sleeping bags together Chest and full-length side baffles"