Climb into the bag via the large oval opening on top; the oversize comforter seals up the opening so you can sleep comfortably no matter your position: back, side or stomachWith a European Norm (EN) lower-limit rating of 17°F, the Backcountry Bed 600 3-Season sleeping bag is suitable for spring, summer and fall backpackingOn warmer nights, flip the comforter outside the sleeping bag and tuck it back for ventilation; insulated hand/arm pockets provide warmth when the comforter is outside the bagDown is considered the best insulation available, but when wet it quickly loses loft and the ability to keep you warm; 600-fill-power DriDown is treated to resist moistureProprietary process treats each individual duck down plume with a molecular-level polymer so the down stays dry longer, lofts better and dries faster than untreated downDriDown insulation stays dry 10 times longer, retains 170% more loft when exposed to moisture and dries 33% faster than untreated downRipstop polyester exterior endures frequent use in the outdoors; polyester taffeta lining is soft and comfortable next to skinSleeping pad sleeve on the bottom of the bag secures your pad (pad not included) to create the experience of a fully integrated bedSierra Designs Backcountry Bed 600 3-Season Sleeping Bag comes with a stuff sack and storage sackImported.