? insulating window shades ...
 

Readership ,

I just recently 'saw' a newer type of insulating window shade on
'This Old House' ...
cant find the TOH URL 'ref'.

.. plastic of some sort, extruded ???
.. raise and lower , similar to a blind

When "lowered",
.. it looked like successive, attached "box" sections from the side ,
when raised ,
.. the box sections collapsed 'flat' at the top 'raised', position.

Anybody know of a reference 'source' ???

Ed