90% heat preservation, put it in your car for emergency, keep you warm; waterproof, used as a outlayer of your primary sleeping bag. When used in a low temperature environment, it can keep its own heat not easily dissipated. The color of makes it easier for rescuers to find that it is actually one of the survival equipment in the wild. Adding a layer of blanket in the sleeping bag can improve the heat preservation ability and is great for ensuring the sleeping temperature. An emergency cold-proof sleeping bag, which can be used as a sleeping bag when resting to isolate the outside air and achieve warmth. Sleeping bag palm-sized, sleeping bag design, easy to collect and easy to carry. In the outdoor environment, it is suitable for field exploration, survey, tourism, and use when disasters occur. It is easy to carry, compact, beautiful and practical. Specification: Colour:green Material:PE aluminum film Size:200 x 90CM Package Contents: 4 * Sleeping Bag 4 * Storage Bag with Whistle Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.