SIZE :Adults (suitable for almost any one at the AGE above 12 years old.) ONE SIZE FITS Adults and Teens: This snorkeling set for Adults and Teens comes with fully adjustable head straps and a high-grade silicon face skirt which molds to fit virtually any face shape. The ribbed design provides extra support and ensures a water-tight seal. With adjustable head strap. ANTI-FOG COATED TEMPERED GLASS: Enjoy maximum under-water visibility. Advanced lens shape design and tempered glass with anti-fog treatment means you'll have a crystal clear underwater experience, especially for beginners. One piece glass design enables better and wider vision under water. FULL DRY SNORKEL with PURGE VALVE + SPLASH GUARD: The advanced anti-splash system prevents water from entering the snorkel and the purge valve allows for easy clearing and draining water out of the snorkel. PROFESSIONAL GRADE MATERIALS: The snorkeling set are manufactured using top grade materials. The silicon skirt and mouth-piece provide maximum comfort and long-lasting performance.