Slip Cat 3-way Retainer The Three-Way features three different options for securing eyewear. Micro 3-Way is Engineered to fit ultra-thin wire eyewear frames. The Fat Cat is designed for the ultra fat eyewear frames. The Fisherman is a shorter version of the 3 Way Retainer in our durable micro 2.5 mm nylon cord resulting in a lightweight, low profile eyewear retainer.