This newer high-performance double pane window includes double silver Low-E on Surface 2 and a Surface 4 Low-E coating.  The Surface 4 Low-E can be Cardinal i89 or another hard coat Low-E offering.  The double silver soft coat (sputtered) Low-E coatings are spectrally selective coatings that perform well in many climates, helping to reduce the Solar Heat Gain Coefficient (SHGC) of the window.  The Surface 4 Low-E coating helps improve the insulating value (U-value) of the window by helping to reflect the heat from inside the building back inside during the cold winter months.  With the protective white vinyl wrap on the perimeter, the resulting window dimensions are 7.2 x 7.2 x 0.95 inches.  A 1/2" Super Spacer is used standard, but other spacer thickness options are available.