The Summit 250 Square Sleeping Bag is perfect for colder camping adventures. With a 3/4 season rating, a comfort rating of -1C to 4C and an extreme temperature of -17C. 100% polyester ripstop, with a square shape for campers who prefer more leg room. You can unzip and attach another bag to create a well insulated double bag.3/4 Season - Cold nights early WinterTwo Way Zip - A two-way zip is useful for easy opening when ventilation is required. Zips can be full length or just half way. Envelope Shape - Envelope shaped bags are essentially rectangular, offering you more space to move around in your sleepDouble It - You can zip two of these bags together to create a double sleeping bag. Remember to buy one right hand zip and one left hand zip if you want to make a doubleRip Stop Fabric - Stop rips in their tracks with this heavy duty fabricInsulation - Insulated with hollow fibre stuffingPacked Diameter - 23cm x 36cmWeight - 1.6kgComfort Temperature - The comfort temperature for this sleeping bag is -1°C to 4°C. This is the minimum temperature that the sleeping bag is designed forExtreme Rating - This bag can be used in temperatures as low as -17C. This is a survival temperature only. The bag is not intended for regular use at this temperaturePersonal Preference - Please remember that everyone feels the hot and cold differently. Always go with your personal preference Great For Cold Weather Camping - Perfect for colder weather camping trips in Spring through to Autumn