The Lifesystems THERMAL BLANKET is a lightweight, packable thermofoil that will help maintain body temperature in the event of an injury or sudden unexpected change in the weather. It is made of a plated durable polyester that reflects back more than 90% of radiated body heat. The cover is waterproof, windproof and reflects radar waves very well. Thermofoil should form the basis of every first aid kit, whether for cycling or hiking.