Royal Journey Full Face Free Breathing Design Snorkel Mask for Adults and Youth. (Blue, S/M) 180 FULL FACE DESIGN- You can breathe through your mouth or nose with this mask and have no mouthpiece to put in your mouth. The innovative full face and ball system design makes it free breathing when you are seeing underwater. Deep, Easy Breaths  Taking in undersea sights is made easier with a unique full-face design that lets you breathe without holding a snorkel in your mouth. Dry Snorkel system at the top allows the valve to close automatically to prevent water from entering the breathing tube. Anti-Fog Lens  The innovative breathing chamber provides streamlined airflow to eliminate fogging for crystal-clear fish and sea life viewing. Elastic Fabric Head Strap : Easy to wear ,hair won't be tied on the strap. Generally, S/M is for women and teenagers,L/XL is for men or woman with long face.You can choose the sizes follow the sizing chart. KIDS AND YOUTH will love the way the mask works as they are learning to snorkel and swim with their head in the water. Plus they will think it's so cool to be able to breathe underwater!