You can look well over the shield and still not experience turbulence, the two piece works that well. At 6'2" I have a 13 adjusted in the middle but notice little difference at any setting. I tried the 17 at first and it was much too tall to see over. You can do an exchange for shipping cost on the outer shield so it is not much. I bet you could use the 13 or 15 at 6'3".