Different from traditional snorkel mask, the full face design allows you to breathe comfortably through your mouth or nose while snorkeling,unencumbered.The flattened large lens reduces underwater distortion for the best viewing experiences. FREE BREATHING DRY TOP SYSTEM- Featuring three completely separate air channels to maximize airflow and help ensure the mask stays fog-free,also stop salt water from getting into your mouth and prevents gagging. It offers superior comfort with a hypoallergenic silicone skirt that creates a leak-free seal around your face.The separate breathing chamber inside the mask isolates the air that from the nose and mouth,so that the heat air is not easy to condense on the mirror surface. In a word,this snorkel mask has everything the modern swimmer needs to enjoy the snorkeling. size: S/M for 14+ S/M size: inner diameter 17*13CM, outer diameter 23*19CM L/XL size: inner diameter 19*13CM, outer diameter 23*19CM Weight: 600g Quantity: 1pcs Material: Silicone+PVC Color: blue, black, red, green, pink