This mummy bag features DownTek, a water repellent down to help to minimalize compression of the feathers in wet conditions. Lightweight enough for backpacking, these bags are designed to feel more like the comforter on your own bed. They provide an overall more comfortable and cozier sleeping experience than ever before with a semi-rectangle shape The bag is lightweight, and packs small, however this is not an EN rated Bag so the temperature rating should be taken with a grain of salt. These bags are taller across the top so you can roll over more freely, while the Free Range hood allows you to move unrestricted while staying hooded and the vaulted foot box creates more wiggle room for your toesies. So comfortable you won't want to go back home.