in Europe we call it "integral insulation" because Kavartherm products are more than a heat shield.

Integral means:

necessary to make a whole complete (source: wikipedia)

The exhaust pipe is sheathed with a high-temperature-resistant insulating material and then the component is firmly welded with a stainless steel shell adapted to the contours.

A new component is created:

The Kavarpipe exhaust pipe, manufactured by SM Auto or provided by the customer, with a durable and heat-resistant thermal insulation to reduce the temperature loss in modern exhaust systems such as Bharat VI (BS-6)