Rangers shortstop Marcus Semien wears a custom double strap Nike Diamond batter’s elbow guard. The color scheme matches Texas’ grey uniforms perfectly. He also has the area code “510” written on one of the straps to honor his hometown of Berkeley, CA.
Most of the features on this guard are exclusive; the double strap design, the personalization options, and the custom colorway. You can still get Nike Diamond batter’s elbow guards, but only the stock version, at DicksSportingGoods.com for $30.
510 is the area code for the East Bay, not San Francisco. That’s where Semien is from (Berkeley/Oakland). Not San Francisco. Very different.