Product Description PortabilityThe size of this sleeping bag is 13.4 x 6.7 inches and weighs only 2.2 lbs. With a compression sack, this sleeping bag has become highly portable. Literally, you can take this sleeping bag to any outdoor destination. Warm and CozyThis sleeping bag is made of hollow fibre filling, which makes this sleeping bag become warm and comfortable. The adjustable half-circle hood with drawstrings can envelopes your head in warmth. The zipper wind baffle will make the sleeping bag to be warm, preventing your pillow from falling to the ground. With the square design, the bottom of the bag is roomy and you can fully stretch your arms and legs. DurabilityThe shell of this mummy sleeping bag is made of high quality 100% polyester which is waterproof. The lining material is 75D micro-brushed which makes the bag warm and comfy when your skin touches against it. It is durable enough for long time use as that the product is resistant to abrasion. The synthetic insulation allows the bag to not only be water-resistant but continues to be insulated and stay warm when in wet circumstances. Advanced DesignThe zipper baffle will make the zipper goes well and a Velcro fastener is used to add security to the sleeping bag. A left and a right sleeping bag can be zipped together to make a double-sized cosy sleeping bag. With two-way separating zip on one side, it will be very convenient for you to get in or out of the sleeping bag. Applicable TemperatureThe suitable temperature of this sleeping bag for males is 7 Degree C / 44 Degree F. For females, the suitable temperature is 12 Degree C / 53 Degree F and the extreme temperature that this sleeping bag can hold can go down to -3 Degree C / 26 Degree F. Overall, this product is ideal for activities such as outdoor camping, sleepovers, family visits, and other situations where there are not enough beds for everyone. Temperature ScalesMost standard sleeping bags have TWO temperature scales: Low temperature: Refers to the lowest temperature that the sleeping pad can hold. This only indicates that you can survive at such a temperature in the sleeping bag, but it does not mean that you can sleep with comfortable experiences under such circumstances, it depends on the different physiques for different people. Overall, we do not recommend using the sleeping bag below or above this temperature range.Comfortable temperature: Refers to the ideal temperature for comfortable use of the sleeping bag. At this temperature, people can fall asleep comfortably without being affected by external factors.It should be noted that the comfortable temperature is only a relative concept. The temperature range listed above is only based on lab tests and field experiments by brander research institutions. You should only use this data as references as each person's body condition and external environment is different.