MYLAR EMERGENCY BLANKETS - Originally designed by NASA for space exploration, these insulating mylar blankets provide compact emergency protection in all weather conditions and any emergency survival situations by reflecting back and retaining 90% of a survival victim's body heat EMERGENCY USE - Great for hiking, backpacking, climbing, camping, traveling outdoors or in the wilderness, and biking. Our emergency blankets are popular with everyone from emergency responders to endurance athletes using them to prevent sweat chills after running marathons. LIGHTWEIGHT AND COMPACT- Each survival blanket is individually folded, wrapped, and sealed for easy storage and retrieval. They are reusable, waterproof and windproof and can also be used for both ground cover and shade. Our advanced aluminized dual-sided thermal blankets are designed to retain up to 90% of body heat and are perfect for use in emergency survival situations.Blankets are waterproof, windproof, and moisture-proof, helping to keep you dry in damp, wet, rainy, and downright cold environments.Perfect for hiking, outdoors, camping, backpacking, climbing. Can be used as ground cover, sleeping bag liner, or to prevent hypothermia and shock in extreme weather conditions.