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The International UV Testing Laboratories (IUVTL) has tested more fabrics for UV properties than any other laboratory in the world. They provide the most complete and comprehensive UV fabric and garment testing available today.

UVBlock® is the official certification provided by the International UV Testing Laboratories. Look for this block on garments to ensure full sun protection requirements. 

The difference between SPF  vs. UPF is this:

SPF stands for Sun Protection Factor. It is the ratio of UV radiation dose required to produce recognizable redness on skin that has been protected with a sunscreen from the UV radiation dose required to produce the same redness on unprotected skin (using a clinical test procedure on human skin). SPF tells you how much longer it will take for your skin to begin to redden with the product on than if your skin was unprotected. The percentage of burning UV rays that a product blocks does not increase proportionally with the SPF value. So SPF values indicate a function of skin reddening.

UPF stands for Ultraviolet Protection Factor. It is the ratio of the average effective ultraviolet radiation (UVR) irradiance transmitted and calculated through air to the average effective UVR irradiance transmitted and calculated through fabric. In other words, it is the amount of ultraviolet radiation that a fabric blocks. Hence UPF values are used in the Fabric's UV transmittance test by spectrophotometer equipment

The Australian Goverment, a leader is UV research for over two decades, has stated that, "Over-exposure to solar ultraviolet radiation (UVR) can cause sunburn, skin damage and an increased risk of developing skin cancer. Clothing provides one of the most convenient forms of protection against UVR but not all garments offer sufficient sun protection"