Question about reflective material?

Hello I have searched the forums, but have not had any luck. Is there a material that can block people from seeing that I am using HID lights inside. I have seen material before, but can not find it now that I need it. Thanks for the help.

mylar?..........

mylar works ok but not 100% if you want something that will reflect a lot and at the same time block out a substantial amount of heat google poly shield. if you're worried ab thermal choppers or cops then this is one way to go.

Thanks, unfortunately they are sold out though. Does anyone else have a website that this can be purchased?

ive torn it up trying to find another place that sells it but it looks like you'd just have to wait for that?