SIZElH (mm) S: 80 H 90 M: 90H 100 L: 100H 115 Much lighter than general masks; Providing a more comfortable experience and making therapy easy to accept; Face matching headgear; 360 degree rotatable elbow: flexible tube position makesminimal effect to sleep; Diffuse Vent Hole: gentle and quiet exhaust; Anti-choke Vent Design: Provides fail-safe operation; Dual Direction Adjustable Headgear: Ensure the most comfort and stability; Breathing Headgear: Ventilative fabric ensures tough inner core; Humanized Design: Ergonomic streamline face touch. Specification: Color: As the picture shown Size: S 80-90mm,M 90-100mm,L 100-115mm Weight: 100g Material: Medical Silicone Note: There could be some slight differences in the color tone of the pictures and the actual item. Please allow 1-2mm differs due to manual measurement, thanks. Package Included: 1PCS * CPAP Snore Respirator Strap Face Mask Note: 1. Due to manual measurement, there may be a slight tolerance of 1-3cm. 2. Due to difference between different monitors, the picture may not reflect the actual color of the item.