The Summit 250 Sleeping Bag is a 3-4 season bag, perfect for outdoor use in chilly weather. With increased insulation thanks to the mummy shape, you'll be kept comfy and snug as you sleep. Long length - it measures 215cm. Max user height 195cm / 6'4 Regular length - it measures 200cm. Max user height 180cm / 5'9 3/4 Season - Cold nights early Winter Comfort Temperature - The comfort temperature for this sleeping bag is -1ツーC to 4ツーC. This is the minimum temperature that the sleeping bag is designed for Extreme Rating - can be used for extreme temperature of -17ツーC. This is a survival temperature only. The bag is not intended for regular use at this temperature Rip Stop Fabric - Stop rips in their tracks with this heavy duty fabric Two Way Zip - A two-way zip is useful for easy opening wh