That is quite a specific fetish. Any idea what it stems from?
I myself have a particular preference for men's arms. I don't know if it is a fetish, but if I am looking at a naked man even with say, a beautiful "member" and also beautiful arms, I am going to be staring at his arms.
I have rationalized this to be the fact that a man's arms represent feeling safe, and protected and to me just seems to be the epicenter of maleness.
I can't say why the soles of the feet get you going.
I find fetishes interesting so long as not harmful.