What is the extra slit next to thumb hole on my running jacket for? : r/Whatisthis

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Buy TrainingGirl Women's Sports Jacket Full Zip Workout Running Jacket Slim Fit Long Sleeve Yoga Track Jacket with Thumb Holes and other Track

TrainingGirl Women's Sports Jacket Full Zip Workout Running Jacket Slim Fit Long Sleeve Yoga Track Jacket with Thumb Holes

What is the extra slit next to thumb hole on my running jacket for

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