IPX7-rated for dust and waterproofing down to three feet for 30 minutes, they can handle extremes of cold and heat (they have an operating range of -13°F to 185°F and storage temperatures of -40°F to 185°F).
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If healthier breathing is your goal, the side sleeping position may make it easier. McCarty points to this position as a natural way for many people to limit the effects of gravity and open the airway during sleep. For example, nasal breathing, which has more health benefits compared to frequent breathing through the mouth, is often easier when you’re on your side because it naturally opens airflow.，详情可参考电影