Created for getting a read on rolling greens in changing light conditions the Oakley Golf M Frame Sweep Sunglasses have a G30 lens for high contrast clarity in flat to low light. The distinct O Matter Frame design gives the Golf M Frame Sweep a refined look that sets it apart from multi-sport Oakley M Frames. Vented openings along the top edge of the lens keep the Golf M Frame Sweep Sunglasses from fogging--especially beneath a visor or cap on a hot afternoon. Add a Fire Iridium and a Slate Iridium lens and you'll have all the light spectrums covered until the sun goes down.