Shinobi Polarized - Obsidian Black Polarized/Matte BlackThe Shinobi sport performance sunglasses is our aggressive premium model with a solid lens attachment for high speed activities. Poor vision shall no longer be your master. Benefiting from the same premium 2. 2mm thick machine edged Toric lens as the Ronin, the Shinobi features an extremely stable and easy to switch lens attachment technology. Simply slide back the two buttons located on each temple, squeeze in the middle of the nose bridge to change