Comments about GIRO Giro Semi Full Sunglasses:

Once again Giro has created a great product. The Semis have it all from great looks to great function. Lightweight enough to forget they're even on your face. With the Zeiss lens, image distortion is a thing of the past. The view through the lenses looks the same around the edges as it does in regular field of view.

One draw back is the lack of an adjustable nose piece, but even so these are great fitting sunglasses. Hands down one of my best pairs ever!

I have used these in high exertion activities in cooler weather and there is very little, if no, fogging. There are two very generous side vents that allows for great airflow between the eye and lens. A little fogging did occur, but was gone with the onset of activity.

Overall I'd buy these again.