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Percentage (%) UVR Block evaluates the capability of the shade cloth to reflect and absorb incident Ultra Violet Radiation (UVR) within the 290nm to 400nm range of the spectrum,this includes both the UV-A radiation(315nm to 400nm) and UV-B radiation (280nm to 315nm). This means that if a commercial shade cloth has a 94% of UVR block, 94% of incident Ultra Violet Radiation (290nm to 400nm) is absorbed and reflected by the shade cloth. That keeps you free and protected from UVR as the shade cloth has absorbed and blocked them.