http://scores.espn.go.com/boxing/story/_/id/12805180/floyd-mayweather-camp-challenge-manny-pacquiao-preapproved-gloves-denied
According to those close to the situation, a contract exists between the two camps that states Mayweather will wear Grant-manufactured gloves, Pacquiao will wear Reyes gloves and neither set can be horse-hair-style boxing gloves. It's common for the inside padding of boxing gloves to be made from horse-hair, foam or a combination of both.
Mayweather's camp protested the commission's approval of Pacquiao's gloves, claiming the Reyes gloves are horse-hair style and do not satisfy the contract. Reyes gloves are commonly known as a puncher's glove among boxing insiders.
LOOOOOOOOOOOOOOOL.