The Big Agnes Summit Park 15-Degree Down Sleeping Bag doesn't just keep you warm and comfy when you're camped up in the mountains; it also gets the job done when you're couch surfing your way across the Rockies in search of perfect powder. The Summit Park's hydrophobic 600-fill down insulation will keep you comfortable when the temperatures duck below freezing, while a grip of features make your night a whole lot more comfortable than any couch bed or futon ever could.For starters, Big Agnes threw in a full-length bottom sleeve, so you can slip in any 25in-wide rectangular sleeping pad to keep yourself insulated from the ground even when you roll around at night. The Free Range hood gives your gourd some room to move around at night, and has an attached pillow sleeve that lets you throw a small camp pillow in there to give your head a lift. Double zippers allow the Summit Park to function as a comforter when you'd rather let your legs hang out. Big Agnes built the Summit Park with box baffles to improve heat retention and limit down migration, and added a draft collar, tube, and wedge to help prevent heat loss during those cold nights you're camped out in the back of your car in a snowy parking lot somewhere on the Powder Highway.