The Coleman? Silverton? 25 F Big and Tall Mummy Sleeping Bag. Keeps you warm in temperatures as low as 25 F and comfortably accommodates campers up to 6 feet 2 inches tall. Coletherm? hollow polyester insulation and a Thermolock? draft tube along the zipper prevent body heat from escaping. Plus, a mummy-style hood with adjustable drawstrings provides the perfect mix of warmth and ventilation.