The Three-Way features three different options for securing eyewear.The Slip Cat is a fully adjustable retainer leaving no excess cord behind the head.The Fisherman is a shorter version of the 3 Way Retainer in EK durable micro 2.5 mm nylon cord resulting in a lightweight, low profile eyewear retainer.Micro 3-Way is engineered to fit ultra-thin wire eyewear frames.The Fat Cat is designed for the ultra fat eyewear frames.