Aluminum film insulation: effectively keeps warm and prevents rapid loss of body temperature. light weight and compact: convenient to carry, suitable for outdoor activities and travel. Waterproof and windproof: Aluminum film can effectively resist rainwater and wind cold. Foldable: Easy to store and easily accessible when needed. Suitable for outdoor activities such as camping, hiking, and hiking. Can be used for various scenarios such as warmth preservation, emergencies, and shading.