The Snorkel Dry Top uses a patented design to keep the inner tube of the snorkel dry. An internal buoy rises when submerged to keep the snorkel dry, and falls when out of the water to allow for easy breathing. The Snorkel Dry Top creates a leak proof seal so water stays out of your snorkel during your swim. Short instructions step through how to easily attach and remove the device. Compatible with Swimmer's Snorkel and Swimmer's Snorkel Jr.