Mylar Emergency Survival blankets are a great low cost, light weight alternative for emergency preparedness. Mylar survival blankets are used by the Military, Emergency Services, Public events, and Survivalist. These blankets measure 52″x 84″. Are suitable for all weather conditions. Made of durable insulation Mylar material. They will retain/reflect 90% of your body heat. Our product is waterproof and weatherproof. Mylar blankets can be used in a number of ways from a thermal cooker, shelter, blanket, sleeping bag, and to signal for help. You should always have a few around the house for emergencies regardless of where you live.