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 Coletherm® hollow polyester insulation helps to retain heat, and the Thermolock™ 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 ZipPlow™ 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.