Strike King Slackwater Bait (New Base Model Vermillion, Adult) The Strike King Slackwater Sunglasses feature Tortise Shell Frame and vermillion lens. Since 1984 Strike King has been a leader in polarized sunglasses for fishermen. New models include lenses made with APT Advanced Polarization Technology. The benefits over traditional CAB plastic lenses are: greater visual acuity (imporved contract and shapness), a more rigid lens and smooth "state of the art" coating creates greater resistance to scratches and hence better optical performance. Polarization in fishermen's sunglasses is a must and a benefit for most all other uses and all Strike King models are polarized.