Thermal blankets serve two purposes in the trunk kit. The first one is they protect you from the elements and help preserve up to 90% of your body heat. This mylar blanket kit comes with ten blankets that are five feet by five feet in size.
Additionally, you can use one to protect your knees or clothing if you are changing a flat tire along the side of the road. They come in a pack a of 10 and are easy to store inside the car.