These things came in vogue about 10 years ago when all the bats got so expensive. While a bat will contract or expand slightly in hot and cold weather, it still isn't noticeable to the naked eye. It does however damage the sturdiness of the material it is made of.
The senior softball bats that are made of a carbon shell will show what will look like a little scratch on the "painted" part. A few swings later it will look like the fender of an old Corvette that was slightly bumped into.
I suggest that you always store your umpire or sports equipment at room temperature to protect it from elements like extreme heat or cold.
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