IR treatment contains particular dispersed additives enabling the infrared component of the solar radiation to be well-absorbed by converting it outward in form of heat (R_est). The light transmission (LT) of the polycarbonate sheets is well kept in the transparent versions (light green 0430) while, in the IR-gold versions (IR-gold / opal 0809 or IR-gold / crystal 0810), there is an iridescent effect and a great coverage. The Gold effect, combined with IR additive, increases the reflected energy (R_est), improving protection and comfort.