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MCS stands for “Moisture Control System” and is a fabric that gives both nylon and polyester fabrics sustained hydrophilic properties ("hydrophilic" means water-attracting). Often used in activewear, MCS actively transports moisture away from the skin and distributes it over a wide area to allow for rapid evaporation. Thanks to the fineness of the yarn and the compactness of the weave, MCS Blocker is a moisture-wicking fabric with long-lasting UV protection. MCS Blocker fabric also frequently provides UPF sun protection.