This double car garage is the model 2255 in White has a 9/16" thick CFC free polystyrene insulation with vinyl back cover. The R-Value on this door is 3.56.
Upgrading your garage door's curb appeal is easy with the standard window design trims, see the glass option brochure here.
R-Value is the capacity of an insulation material to resist heat flow. The higher the R-Value, the greater the insulating power.