A helmet will protect your head from obstacles like tree branches. It will also absorb most of the impact of an accident and minimize head injuries.
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Don't let your hair hang out of your helmet when on the track. Tuck it in the helmet completely. Untied long hair could cause injuries if caught in the spinning wheel, especially.
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Karting gear should be fitting for good reason. Most go-kart components are exposed, so your clothes can be entangled easily. This can result in bad injuries but is avoidable by wearing proper clothing
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If you don't wear a seatbelt and you find yourself in a situation where your kart had a violent impact, you will fly off the kart and suffer serious injuries. A seatbelt will keep you in place in case this happens
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