Spandex inner wrist cuff with thumb hole, protecting hands from cold.

手腕袖口内带有弹性的拇指出口，帮助手部抗寒。

youdao

It even has a thumb hole if you prefer to nap with it tucked over your hand.

它上面还有个拇指洞，喜欢的话可以把它直接套在手上睡。

youdao

There's a hole in the thumb.

手套的拇指上有个窟窿。

《牛津词典》

Other base stealers who use gloves either wear small guards or professionally manufactured gloves that have a thumb hole, and also extend over the wrist, like Davis's glove, giving it a similar oven-mitt appearance to Gardner's newest device.

WSJ: It's for Sliding, Not Baking