Costa Sunglasses Blackfin PRO Color:Midnight Blue-Gray Polarized Glass (580G) Comfortable and durable flat seam

Comfortable and durable flat seam construction

new stickier Hydrolite® and metal keeper slots keep your frames and your focus locked in

sustainable process

Flexible rubber sponge outsole

Costa Sunglasses Blackfin PRO Color:Midnight Blue-Gray Polarized Glass (580G) Comfortable and durable flat seamAn enhanced version of one of Costas most trusted and well loved frames, the Blackfin PRO builds off the original look, polarized lens and fit with six new angler approved additions to keep you on the water longer. Along with a vented and fully adjustable nose pad for a custom fit, sweat channels and eyewire drains will help keep your vision clear, while side shields, hooding, new stickier Hydrolite and metal keeper slots keep your frames and your