U.S. Divers Cozumel LX Swim Goggles with Airent Snorkel Adult mask - One-size-fits-most; Hypoallergenic silicone face skirt for ultimate comfort; 3-way adjust Pro-Glide buckles for easy adjustments Snorkel Features: Wide open tube for unobstructed breathing and one way purge valve for easy clearing Snorkel placement - Place snorkel on left side of face attaching snorkel keeper clip to mask strap