I use open fronts on my showjumper and it really helps him
If your boy does have a problem with over reaching I suggest you put bell boots on him. .
With open fronts it protects them from the hard groung and hurting themselves but laso if they do hit a pole they know because they can still feel it
If you could try to get hard case one that the outside is got a hard covering wetherbeeta has gel ones that have a gel inside and a hard outside it just hasmore protection that's the reason I like them. . =]