Wilson A2K Series: A2K0BBG2800 First Base Mitt Pro Stock Select Leather - Each Wilson A2K is constructed from the top 5% of world-famous Pro Stock Leather which is the secret behind the A2K's unmatched durability and lifespan. 3X More Craftsman Shaping - A master technician spends 3x more time pounding and shaping your glove by hand at the factory - reducing break in time for you. Rolled Dual-Welting - Thin strips of Pro Stock leather are skived thin and rolled to provide long lasting shape, but allowing for a quicker break in. Pro Stock Patterns - Exclusive Hand designed patterns used by the pros 2X Palm Construction - A thin, strategically cut piece of leather is palced between the palm liner and outer shell, providing maximum pocket stability and quicker break in.