The AmericanKIP series glove is the stiffest among all the Nokona glove series. Therefore, it requires the most effort to prepare it game-ready. The break-in time is dependent on your expertise and break-in process. The Alpha series gloves are made with super soft leather. Therefore, they are the softest and require the least time to prepare for the game. The other two series are in between. They need a moderate effort to break-in.