there are literally thousands of PUGs posts here and on other hybrid forums, with at least a 95% approval.
probably even more on popup forums.
if you're handy at sewing, you can buy some of the generic 5x7 versions from numerous sources, about $13 each average and make your own. you'll need 3 to cover two tent ends.
Bob Pitney at PUGs, will even sew velcro on them, for a small price if you want to do that type of attachment.
Bob also has stated that they have tested them and turning the silver side down, in cooler temps, doesn't make any difference than leaving them silver side up.
and Zoe the Wonder Dog(R.I.P.)
'07 Roo 23SS pushing an '07 Chevy Avalanche
Equalizer WDH and Prodigy BC