Sun reflective material cut to fit windows

JCH4

Observer
Does anyone know where you can purchase the silver reflective material used to reflect sun from windows. I have the G500 version from Vlad at fourbyfourclub which works great but want to add material to back windows also. Will cut to fit.
 

chet6.7

Explorer
I have found Reflectix at big box home improvement stores but only in the winter around here.I have also ordered it from Amazon when I wanted it during the summer.
 

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