The Champion Sports Foam Filled Nylon Cover Base Set can complete any baseball diamond. Featuring a nylon cover, these bases are sure to hold up to regular use during game-play, including against cleats and aggressive slides. Depending on your baseball base needs, there are variety of base options to choose from with regards to exterior material, base thickness, base straps, and securing spikes. These bases are easy and convenient to lock in place and remove after the game.