The hybrid shape of the Coleman? Big Basin? 15 Big & Tall Sleeping Bag gives you all the added warmth of a mummy and the extra space of a rectangular bag, perfect for when the temperature dips down to 15 F. On warmer nights, simply keep the adjustable hood loose and open up the two-way zipper to get custom ventilation. When things cool off, lightweight polyester insulation helps to retain heat, and the draft tube helps to block warmth from escaping through the zipper. The fleece-lined footbox and special quilting construction surround your feet and body to help eliminate potential cold spots. Thanks to the specialty zipper, you'll get snag-free opening and closing every time. A durable, ripstop-reinforced polyester cover will ensure you get to use this extra-warm bag season after season.