Our emergency thermal blanket provides warmth and deflects heat in hot climate, providing compact emergency protection in all weather conditions. Reusable, waterproof and windproof. This compact emergency blanket can be used as emergency shelter. Also great for camping, hiking, and surviving the cold outdoors. Excellent as liner of sleeping bag. Made of durable insulating mylar material designed by NASA for space exploration. Blanket size is standard 63" x 83" (160 x 210 CM). Retains/reflects back 90% of body heat. Thickness: 12.5 um. Pack of 4 blankets.