NEMO Equipment Sonic -20 Sleeping Bag Goodnight Gray / Torch Long. The Backpacker Editors Choice award-winning big-mountain bag offers exceptional warmth and tuneability with a reduced environmental impact. This bag features next-generation Thermo Gill vents with a multistage zipper system that dramatically increases the usable temperature range of the bag and allows fine-tuning of comfort from within. Sonics chevron baffle construction better compartmentalizes down eliminating migration and keeping the down evenly lofted. (Not to mention it looks awesome.) Specifications for NEMO Equipment Sonic -20 Sleeping Bag: Manufacturer: NEMO Equipment Color: Goodnight Gray / Torch Temperature Rating: -20 Bag Shape: Mummy Zipper Type: Left Gender: Unisex Age Group: Adults Application: Camping Fabric/Material: Nylon Warmth Rating: -20 Package Contents: NEMO Equipment Sonic -20 Sleeping Bag NEMO Equipment 811666034557: Sonic -20 Sleeping Bag Goodnight Gray / Torch Long