This 84" x 52" Emergency Insulated Thermal Sleeping Blanket is an essential emergency or camping kit item. Mylar foil assists the body in heat retention during emergency situations. Can be used as a regular blanket in cold conditions while sleeping. It's also reusable and won't tear easily, allowing for multiple uses in different situations. Waterproof and windproof. Will not crack or shrink. It also reflects 90 percent of your body heat back to you, making it ideal for offsetting hypothermia reaction