Originally Posted by GHanson
Trying on C3s I discovered the L was comfortable to the point of almost loose.
The M was snug but no apparent hot spots even with a helmet liner under it.
My C2s were both L and I remember they started off with the snug feeling when I bought them five and six years ago. Sean at Atlanta BMW says other C2 wearers have been going down a size in the C3.
The above statements are inop, at least for me. After some consideration went with the L, FWIW.