Switchlock Technology features 6 magnets around the frame designed to allow you to quickly adapt to changing weather conditions, while two mechanical locks give you the confidence of lens security. Discreet frame notches at temples provide compatibility with most prescription eyewear Available in Prizm Lens Technology options. Fit: Large Single-Layer Lens for decreased optical distortion, refraction, and reflection To be more aware of our environmental impact, Line Miner Pro is made with a bio-resin frame, recycled polyester strap, and is housed in a recycled polyester micro bag. It also comes with an Oakley protective case to protect the longevity of your goggle for increased durability.