The ideal temp of this cotton sleeping bag is 17.6-54°F, meaning a sleeping bag for camping can accompany you through the spring, summer, and autumn 3 seasons. Our flannel lined sleeping bag allows you to enjoy a comfortable and spacious sleep like a bed at home. KingCamp waterproof sleeping bag filling 250g/㎡ hollow fiber and 100% cotton flannel lining offers excellent warmth and comfort throughout the night. Our tall sleeping bag adopts a new diagonal quilting design, which can better fix the cotton, lock the temperature of every inch of the hiking sleeping bag to enhance the warmth of the bottom. It is very suitable for outdoor activities in autumn,summer,spring.