Iplus neutral S is a softcoat glass it lowers heating costs and helps to save energy, it not only keeps the heat in the room and uses suns rays to enhance supply, but also causes a perceptible increase in the pane surface temperature.  Seen from the outside, you can hardly distinguish the Iplus S from conventional double glazing.  The colour is neutral in reflection and transmission, with the U-Value, compared to ordinary double glazing, is improved about 60% down to 1.2W/m2K and 1.1W/m2K argon filled.