Bench Shirt Question

[Elbutcho]

I've been out of the game for some time but what's up with the open back shirts???

[Elbutcho]

What no one knows???

[KevinStarke]

There easier to get on and give more pop.

[Elbutcho]

There easier to get on and give more pop.

I can see that they would be easier to get on but I wonder how they give you more power..............anyway thanks.