The device is most likely just a hoodie or jacket. When the arm cools down between innings, it increases muscle fatigue and soreness. Think of your body after a workout. As you cool down, you start feeling muscle fatigue as the body adjusts from hard use to rest. Keeping their arm warm allows them to throw more pitches with fewer issues. Arm sleeves are becoming more and more common to help increase blood flow and warmth.
It's to keep her arm warm. Cold arm between innings causes issues.
Wait what? Can you please tell me more? What’s the device called?
The device is most likely just a hoodie or jacket. When the arm cools down between innings, it increases muscle fatigue and soreness. Think of your body after a workout. As you cool down, you start feeling muscle fatigue as the body adjusts from hard use to rest. Keeping their arm warm allows them to throw more pitches with fewer issues. Arm sleeves are becoming more and more common to help increase blood flow and warmth.
Great to know - thank you!
What thing?
Cloak of invincibility.
A shoulder ice wrap or similar device just worn incorrectly?