Base runners are wearing a special protective sliding mitt (often nicknamed the “oven mitt”), not a regular batting or fielding glove.

What that glove actually is

  • It’s called a sliding mitt or oven mitt and is designed specifically for when players slide into bases.
  • Most players only put it on after they reach base and take it off when the inning ends or they’re no longer on the bases.

What the sliding mitt does

  • Protects fingers from jamming or bending back when diving headfirst into a base or diving back on a pickoff move.
  • Shields the top of the hand from cleats and tags with hard or semi-flexible plates and padding over the knuckles and back of the hand.
  • Adds wrist protection with extended padding or a sleeve-like design over the wrist area.
  • Some models use non‑slip or grippy palms so the runner doesn’t slide past the bag as easily.

A common way fans describe it on forums: “It keeps them from jamming their fingers diving back to the bag” and “it’s like an oven mitt for sliding.”

What it’s made of and how it’s built

  • Typically a mix of synthetic materials, neoprene, and sometimes leather, with internal padding on both the top and underside of the hand.
  • Many high-end versions have TPU or plastic plates plus Kevlar‑reinforced areas to absorb impact from bases and cleats.
  • One-size or adjustable designs are common so any runner can strap it on quickly.

Is there a rule about size?

  • MLB already has rules limiting how much a glove or mitt can artificially extend reach, and teams are cautious not to violate those standards.
  • Fans have asked if someone could wear a “two-foot-long” mitt; umpires can shut that down as making a “mockery of the game,” even if the exact mitt size isn’t spelled out line by line.

Quick comparison: fielding glove vs. sliding mitt

[1][2][9] [8][5][3] [2][9][1] [8][5][3] [9][1][2] [7][5][3] [1][2][9] [5][8][3]
Feature Fielding glove Sliding mitt
Main purpose Catch and field the ball.Protect hand and wrist while sliding.
Shape Five-finger glove or mitt with a pocket.Closed mitten with no finger separation.
When worn On defense, entire time in field.Only while running/standing on base.
Key features Pocket depth, web style, leather quality.Padding, rigid plates, gripy palm, wrist guard.

Why they’re everywhere now

  • As base running has gotten more aggressive, players and teams put a bigger emphasis on reducing hand injuries from steals and dives.
  • Sliding mitts started as a niche accessory but have become standard from MLB down to youth and travel ball over the last several years.

TL;DR: Those “weird gloves” base runners wear are protective sliding mitts designed to keep their fingers, hands, and wrists safe when they dive into or back to a base.

Information gathered from public forums or data available on the internet and portrayed here.