Specification Material: Material: ABS silicone Color:as the picture Size: S/M size: inner diameter 10-12CM L/XL size: inner diameter 13-19CM Features 1. Dual Airflow Anti-Fog TechnologyThe Dual Airflow Technology Can Help You to Breathe Naturally as On Land. By Changing The Inspiratory and Expiratory Airflow Channel to Achieve Anti-fog Effect 2. SealedIn Water, Top Value Automatically Locked to Prevent Water From Entering Through the Snorkel Tube 3. Drain ValveWhen Water Entering the Mask, You Just Need to Raise Your Head The Water Will Flow Out From The Drain Valve. 4. Full Face 180DEG Field Of Vision, Unprecedented Visual Experience 5. Medical Liquid Silicone, Soft, Durable, No Odor, Safety for Your ScubaEasy Dressing Adjustable Elasticated Textile Strap That Does Not Pull Your Hair OutNote: The Camera Are Not Included (without camera)Washing method: Properly clean the mask after use to keep the vision clear and ensure that the ventilation function is normal to prevent foggingStorage: Dry naturally after washing to avoid direct sunlight