Ergonomic, lightweight, and contoured design made of soft medical silicone - making it extremely durable, flexible, comfortable and easy to clean. Designed to fit comfortably and provide an excellent seal without the need of a forehead support. 360° dual swivel elbow port allows for free movement and easy connection to the hose. Contours naturally to the face and is designed with ribbed support for comfort fit and seal enhancement. Quick release clips allow mask to be easily removed without resetting the headgear for convenience. Air vent holes and one-way valve design; the exhale port is designed to minimize CO2 retention. Various sizes available - choose from full face or nasal mask options. For hygienic reasons, this item is not returnable after the product packaging is opened.