This Cushion is Dual Walled And is Designed to Distribute Pressure Evenly Along All Sides of Your Mask. Cushion is Made of Silicone/Nylon. Dual Walled, Spring Air Cushion. Why not collect your item for free?.
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Replacement Set for Resmed Airfit F20 Replacement kit with Small | Medium | Large Cushion, Variants Headgear, Frame, Clips Great-Value & Quick-Disconnect- Covers Nose and Mouth (Medium Cushion Set)