These Oxigen metal-frame men's semi-rimless glasses have frames that are as sleek as possible. Sporty people want to have aerodynamic sunglasses that will go with the clothing they are wearing. Different sunglasses are built in a way that adds to the drag that a person will encounter. Anything that a person wears will cut down on drag. Athletic people need to have as little drag as possible if they want to move freely throughout the world. These sunglasses allow them to protect their eyes from harmful ultraviolet rays without affecting their athletic output. They are not as colorful as most sporty glasses, but they get the job done.