Ergonomic Design -  contoured fit for nose, chin and cheeks
 
Super Comfortable and Durable -  made with soft, lightweight food-grade, non-toxic silicone (contains no BPA, latex, lead, or phthalates and can be sterilized with alcohol, soapy warm water or you can  even boil them in water for 2-3 minutes)  
 
Breathable Cool Flow Exhalation Technology -  includes a cool air flow exhalation valve with a KN95 medical-grade filter