When my bridge screen dies with the contant wind and sun downhere in the Caribbean. I used these best thing I did reflects all heat etc and happen to fit my bridge windowws and just drop in the fram, They fold like a fanbelt with 11/2 turns I Seem to remember they were something like 2 for $10 Mine are still going strong some 2 years later . They are around 26x30inchs each.
Have a look on amamzon they selll all sizes. Thery fold to around 1/10 of there size and a 1/8' thick