Take in the sights under the water with confidence when you have the U.S. Divers Adults' Cozumel DC Snorkel and Mask Combo. The double window construction provides protection and visibility. The 3-way Pro-Glide buckle closure encourages a secure, comfortable fit. The mouthpiece with Hydro-adhesion top valve prevents water entrance, while the 1-way purge valve provides easy water removal for safe, efficient wear.