Costa Slack Tide Sunglasses Matte Black/Shiny Tortoise Gray 580PWhen the tide goes slack, so does the fishing. In Costas athleisure Slack Tide sunglasses you can move on to another spot to chase a different adventure. This laidback west coast inspired frame is infused with functional elements Hydrolite padding, pin hinge, ventilation and 580 Polarized, 100% UV Protection lenses so you can see through multiple tide changes. Model name: Slack Tide Frame color: Black Shiny Tortoise Lens color: Gray Lens material: