This 84” x 52” Tactical Medical Solutions Heat Reflective Emergency Rescue Blanket is great for keeping casualties warm or to pack in a go bag. When you don’t have the space for a Helios®, this is your best bet. The blankets work to keep you warm by their very design. As an impermeable metalized plastic sheet, they trap up to 90% of the radiated body heat that would normally be dispersed into the environment.