Emergency Mylar Blankets - 84" x 52" (6 Pack) 6 Pack. Individually Folded and Sealed: 4" x 3". Opens to: 84" x 52" (each) 6 Pack. Individually Folded and Sealed: 4" x 3". Opens to: 84" x 52" (each) Retains/reflects back 90% of body heat Made of durable insulating mylar material designed by NASA for space exploration Reusable, waterproof and windproof