sentences:  Professional and adult players may instead wear a visor that protects only their eyes, or no mask at all; however, some provincial and state legislation require full facial protection at all non-professional levels.Rules regarding visors and face masks are mildly controversial at professional levels.Some players feel that they interfere with their vision or breathing, or encourage carrying of the stick up high in a reckless manner, while others believe that they are a necessary safety precaution.