The Optitank is one of our more popular selections. This option comes in a white color only, but has a light dependent pattern similar to the effect of a hologram or magic eye - its super trendy and cool! Our design team really got into this one. Our former Sole Master Jonathan Verda (a key figure in establishing our sole factor program) always indicated this as being his indisputable favorite. Goes best on an economical, basic lifestyle shoe. Give your shoes the optitank skin today!