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The InfinitySeal cushion is designed to stay sealed at any airflow pressure setting. It features specifically-designed loops and varying thickness levels to prevent blowout. Why is the AirFit F20 mask cushion made from silicone material? Most CPAP masks have silicone cushions because it’s a hypoallergenic material that’s soft, lightweight and allows for a stable, comfortable seal on your face while you’re sleeping.