Polarshield Sleeping Bag Style Survival Blanket is made up of polyester material designed from insulation use in space exploration. Designed in a sleeping bag style. Reflects and retains 90% of body heat. Lightweight material. Emergency protection in all weather conditions. Waterproof, windproof, will not crack, mildew or shrink. Compact for easy storage in emergency kits, travel gear, car or home. Casualty blankets is usually used in cases of emergency since hypothermia is a major risk for a casualty, the blanket must be wrapped around the casualty to avoid the heat leak. A must for any camping survival kit. Doubles as a suntan blanket. Ideal for hunters, backpackers, or anyone subjected to adverse outdoor conditions.