Features of the Sierra Designs Backcountry Bed Duo 20 Degree Sleeping Bag Patent pending zipperless design provides an ultra-comfortable lightweight bag 650 Fill power DriDown for lightweight warmth Oversized integrated comforter gives all the comforts of your bed at home Full-length, insulated hand/arm pockets help to seal out drafts and seal in warmth Patented self-sealing foot vent provides fast and easy ventilation Stretch cord closure system helps to seal out drafts Sleeping pad sleeve keeps pad under you for comfort and warmth, and replaces unnecessary bottom Insulation