Lifesystems Emergency Thermal blanket - heat reflective, windproof, waterproof, and easy to use. Ideal for emergency insulation in extreme weather, keeping an accident victim warm, or helping someone with hypothermia. These lightweight, compact blankets are bright orange and radar reflective to help locate casualties. They keep you warm by reflecting 90% of your body heat back, as well as being water and windproof. They can be reused, but they are designed as a single-use item.