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By the joint R&D, Swiss companies Clariant and Schoeller Technologies has developed this new technology of fabric treatment called COLDBLACK. It reduced the heat from black clothing and protects the wearer from harmful sun lights.
 
In general, the white fabric can reflected 100% sun light and the black almost 0%. COLDBLACK can make the blacks reflect 80% sun lights (including Ultraviolet UVA and UVB), able it to be tagged at least as UPF 30+ factor.
Experimenting with human sweat, when the clothes are applied with COLDBLACK technology, it reduces 5c at indoor and reduces 12c outdoor. Heat absorbent is much reduced in this case, so a more comfortable wear and lesser sweat factor works like a gem.