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Thanks to its patented 3-in-1 system, this is an eyewear retainer, a soft case and a cleaning cloth all in one! Double-roll construction allows soft case and cleaning cloth to be rolled up and hidden inside of retainer strap. Center section of strap unrolls to become a lens- safe cleaning cloth. Cloth can then be stretched from hinge to hinge across glasses and used as a soft case. Constructed from high-quality, super-soft DuPont(TM) microfiber.