John Sullivan likes to play outside when it gets cold – very cold. But the attendant drawbacks of athletic exertion in sub-zero temperatures can dampen the fun, and Sullivan believes most cold-weather masks create more problems than they solve. Goggles fog. Breathing is impaired. Exposed skin is frostbitten. And for winter athletes who spend extended time in extreme conditions, cold weather-induced asthma can be a common affliction.

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