Some of our most classic Mitchell & Ness Cooperstown Collection Batting Practice Jerseys are back in stock for the summer! Stock up on your favorite baseball legend's authentic 1/4 zip and pullover BP Jerseys before they're gone again!. 100% Poly mesh body; layered twill; woven cooperstown jocktag; self fabric name/ yr player ID label button placket; knit rib sleeves and neck.