I don't know! But I don't know if they think I have a medium or a large face. When I tried on a bunch of goggles at REI, I found that *on me* most of the other OTG models fit OK over my glasses until it was time to take off the goggles, at which point they tried to take my glasses with them. These don't do that, at least as long as I tug the straps sideways when I'm taking off the goggles.