Helmets come in many different shapes Some have plastic visors on the front to shield eyes from sun or rain.
头盔有不同种的类型,有些头盔的前方带有塑料帽舌是为了保护眼镜免遭太阳的暴晒和雨天的雨水。
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Because they're so light and have lots of openings for air to pass through, helmets aren't any hotter than having your head exposed to the sun while riding.