Reflects radiant heat up to 2000°F!Thermo-Shield is a combination of materials laminated together to provide a barrier against the extreme conditions that underhood components are exposed to. Radiant and conductive heat in the underhood enviroment can destroy hoses and wiring by drying out or melting the rubber and plastic of these components. This aluminized adhesive-backed tape is great for wrapping the hoses and wires you don't want to remove. The ''Ultra'' Thermo-Shield is 2-times thicker than the original Thermo-Shield for an even greater heat range protection.