I'm glad to see these questions posted. My concern with it is that I pinned my number to my shorts since I didn't know if I would be adding a shirt or jacket above tree line. So at A-frame since the reader is "chest high" will it register if I wear my bibb pinned to my shorts. Even if I put it chest high that is about waist high on the average person!! (I'm short!). I am not going to win or place, but I do want a finish time (and medal of course!)