The Sleeping Bags can be used for all seasons. They are designed for 0/5~15 Degrees Celsius. Moreover, these bags also have a weather-resistant design to keep you warm even in extreme conditions. Separated zipper at the bottom can also make your feet often come out through the wind. Half-circle hood with adjustable drawstring keeps your head warmer even in extreme conditions. Outer Cover is premium 190T Taffeta polyester which is waterproof and and Breathable; Lining with 190T polyester pongee. 86.6" L x 30" W