Plastic allows the hand/wrist to slide in the event of a fall, preventing the hand from locking in the wrong position in the event of a fall. At least that's the theory and I can say I've had a few small leaks at slower speeds (<5mph) and it works as intended. The plastic pieces attach to the glove with Velcro and stay secure. Remove to wash gloves as needed. Good product for the price. I would buy them again.
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