The structure and quality of the baseball glove has developed greatly over the past century. Today, the production of baseball gloves is much more precise and efficient. This has greatly increased the usefulness and accessibility of baseball gloves to the general population. Currently, Easton is "experimenting with combining leather and Kevlar (used in bullet-proof vests) in a new ultra-light weight glove line". Manufacturers have also designed new, non-traditional types of gloves to suit non-traditional players. Also, manufacturers are personalizing gloves for high caliber players to help increase their exposure on national television. Even though there have been many advancements in the design and creation of the baseball glove, the greatest came in the invention of the catcher's mitt. However, as a Wake Forest University study demonstrated through 39 minor-league players, even though today's catcher's mitts are state-of-the-art, they still do not offer enough protection from long-term injury to the hand and wrist.