The size Medium fits perfectly. The wires over the ears are extremely stable when cycling, lifting weights, and running. Mit dem 44. I might get other colors. Dont get me wrong, its still cold - especially since I live in South Florida), so I went the full hour the first time. These glasses are amazing! The build quality seems very good and as for the mic, it works fine and I have had no issues for this week of use. Once satisfied with location of the roof rack assembly and the bar, continue to completely tighten the roof rack assembly. Plus, I hate that it cuts out sound around you. Because I decided to have a headset with an extended to-my-mouth microphone so I could be heard clearly and directly when I speak into my cell phone to others AND because I dont want to stress my headphone jack, I tried this microphone piece thinking that I could connect it to my LG ANDROID via USB adapter.