Using a unique process, the Zinc and regular polyester are spun together to create a truly special yarn, which contains all properties of Zinc, the properties won't be washed out, it's a permanent function from the original yarn. Zinc ----- antibacterial and UV-cut. Property of antibacterial that can exhibit antimicrobial activity against various bacterial and fungal strains when doing sports out, anti-odors at the same time. UV-cut, also called UV protection - which can effectively resist 99.99% of the UV, the protection class is UPF 50+, keep skin away from troubles. The fabric is suitable for tops with elasticity, touch comfortably.