Improved Shieldmate( Miniatures Handbook, p. 27)
[Fighter Bonus Feat, General]
You have an outstanding ability to protect those near you with your shield.
Shieldmate (MH) , base attack bonus +4,
As Shieldmate, except that the bonus is +2, or +3 if you are using a tower shield.
A fighter may select Improved Shieldmate as one of his fighter bonus feats.