Category 1 to 3 photochromic lenses - full UV filter: adjust to the brightness
Lens vents: reduces fogging.
Polycarbonate lens: shock resistant Very flexible arms
Grip at the tip of the arm and nose bridge: keeps the sunglasses from slipping.
Adjustable nose pads: adjust to the size of the nose.
Lightweight running sunglasses: 22g.
Wraparound design: protects the eyes from wind, splashes and bad weather.