Proflow's express aramid heat shield sleeve uses aluminum and aramid material sewn into a sleeve to act as a thermal barrier capable of reflecting up to 90 percent of radiant heat (requires minimum of 1 inch airspace and good airflow). This sleeve uses a hook and loop fastener system, so it can be installed without the need to disassemble components or removing lines, wires or hoses. Used to protect fuel lines, wiring looms, air intake, intercooler pipers and air conditioner hoses.