The Labeling of UV-protective Textiles: UPF Value Has to Be Declared!
UV protective capabilities of a textile fabric are ranked with UPF value, that is the acronym for Ultraviolet Protection Factor.It’s the ratio of the average effective ultraviolet radiation (UV-R) irradiance transmitted and calculated through air to the average effective ultraviolet radiation (UV-R) irradiance transmitted and calculated through fabric (ref. ASTM D6603).
When a fabric is declared UV-protective UPF must be declaredin order to permit consumers to compare the amount of protection provided by various textiles and purchase the product that best meets their sun protection needs!___
Consider that when skiing or snowboarding you are typically at 8,000 feet (or even higher!) above sea level. That means you are exposed to 40% more UV radiation and snow can reflect up to 90% of the sun’s UV rays back at you!
From Internet
14 April, 2012
