The Motorola MotoRokr S9 bluetooth headphones were also very small and do not fit my fat head (I wear a size 7 3/4³ fitted hat). The back head band touches the back of my neck. When I look around the headphones try and pull my ears off just like the Logitech FreePulse bluetooth headphones (PN 980461-0403).
The design is not for glasses because they are so tight on my head. The last picture points out the fact that the red plastic piece does not really fit right. I did not test if the unit works with my phone because they are just to small.