NEMO Sonic Mummy Down Sleeping Bag

Sonic is built to be the only bag you need from -20F to 40F. The Backpacker Editors' Choice award-winning big-mountain bag offers exceptional warmth and tuneability with a reduced environmental impact. This bag features our next-generation Thermo Gill vents, with a new multistage zipper system that dramatically increases the usable temperature range of the bag and allows fine-tuning of comfort from within. Sonic's chevron baffle construction better compartmentalizes down, eliminating migration and keeping the down evenly lofted.