It is similar but my stuff comes from an insulation specialist at $49 a metre. It's aluminiumised one side and self adhesive the other, it's actually 10mm thick so my box is 20mm thick 2 layers, not 1'.
As zanda has seen just about any box material will work when the car is moving, the thing is how long will it resist heat soak eg when you'r hanging around the staging lanes.