Japanese Kip leather is widely considered to be the highest quality leather for baseball gloves. It is very soft, supple, and durable, with a buttery texture and rich color. Japanese Kip leather is typically used in higher-end custom gloves, and it is a popular choice among professional players and serious amateurs who are willing to pay a premium for the best possible quality.

U.S. Kip leather is another high-quality option. It is known for its durability and stiffness, which can provide a more structured and stable glove. U.S. Kip is typically used in mid-range to high-end custom gloves, and it is another popular choice among infielders and pitchers who need a glove that can handle repeated use and maintain its shape over time.