My daughter plays softball all year round when we travel, so we sometimes play tournaments in 30-40 Degree. If you buy the right size, this is a good, comfortable fit. The racket will not fall when hung upside down on a fence. My husband tested the case by leaving his racquet outside in 20 degrees overnight and the racquet was still at room temperature the next morning. It is not designed to heat a racket. This is an insulated cover to maintain the racket's internal temperature. Expensive composite bats are prone to damage at low temperatures.
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