This material is essentially bubble wrap sandwiched between silver mylar layers. It is good for laying in an attic, to reflect or hold the heat and add some insulating.
The material is 4' wide. I have the remains of a roll, plus a smaller cut off piece. Sorry, don't know the length - didn't want to unroll it to measure it.
Silver "bubble" Insulatiom (Ossining)
This offer has been gifted to some one and is no longer available.