The sleeping bag is made of 170T polyester waterproof shell fabric and cotton flannel lining are skin-friendly, soft and warm. The comfortable temperature is between 0°C/32F and 10°C/50F, and its limit temperate is -5°C/23F. Great versatile product for survival, backpacking, biking, scouts, camping, good choice for all guide and outfitters, can become double sleeping bag when you connect two sleeping bags together. It is easy to compress, lightweight, small packing size which is convenient to carry around.