Originally Posted by Jerry52
My girlfriend is very concerned because when I walk my right foot involuntarily turns almost 45 degrees to the right instead of pointing straight forward, and the left side (instep?) of the same foot sort of "rolls" over the left side of the shoe.
You may already know that but this is called pronation.
I have the opposite issue - I supinate, i.e. my foot sometimes rolls over on the ankle side, which caused a couple of bad ankle sprains.
Everybody pronates or supinates to a certain degree. If you find that it causes you to trip frequently (foot rolling over). You should see a doctor who will prescribe some shoe inserts to correct the problem.
Otherwise, for maximum comfort, you should go for "straighter" last shoes (i.e. not with too much curvature)