[face fabric] 20D recycled polyester ripstop Imported Customizable Fit System - Features patented expandable side panels that add up to 10 inches of total girth when fully unzipped. This ultralight sleeping bag adapts to your individual sleep style—keep it snug for maximum warmth or expand for more movement, perfect for varying cold weather conditions Secure Sleep System - The Padlok design attaches to your sleeping pad (sold separately), ensuring you stay on your pad all night. The integrated Pillow Barn secures your camping pillow in place for consistent comfort in this backpacking sleeping bag Premium Insulation - Baffled construction with 650-fill DownTek PFC-Free insulation maintains warmth even when damp. The jacket-style hood, insulated zipper, and 3D draft collar maximize thermal efficiency in this cold weather sleeping bag Ultralight Performance - Constructed with recycled 20D polyester ripstop, this hiking sleeping bag balances durability with minimal weight. The 0-degree Long size weighs 3 lbs 16 oz and compresses to 12" x 13", making it ideal ultralight backpacking gear Thoughtful Details - Includes interior loops for securing liners, compatibility with left/right zip bags for partners, and both mesh storage sack and stuff sack. Optional compression options available for further backpacking gear optimization The Big Agnes Torchlight EXP Sleeping Bag delivers customizable comfort with its innovative expandable side panels that add up to 10 inches of adjustable width. Premium 650-fill DownTek PFC-Free insulation provides exceptional warmth while the integrated Padlok Sleep System keeps you securely on your pad throughout the night. Thoughtful features include a contoured hood, insulated draft collar, and Pillow Barn for consistent head support. Constructed with recycled 20D polyester ripstop, this bag balances durability with minimal weight and impressive packability. Whether you prefer a traditional mummy fit for maximum thermal efficiency or need extra room to move, the Torchlight EXP adapts to your individual sleep style, making it the perfect choice for backpackers who demand versatility without compromising performance.