Improve your technique with the Arena Swim Snorkel III by strengthening and enhancing your breathing workouts. The new headband strap makes it even easier to wear and adjust to a fixed position. The one-way purge valve eliminates water inhalation during flip turn. The headbance strap and mouthpiece are made from 100% PVC free liquid silicone for ultimate comfort. Center constructed uni-directional headband provides increased stability and makes it easy to breathe and rotate. The quick-release clip makes for quick adjustments of strap length for custom sizing.