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. 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.