🎀【How to Measure】First close your mouth and measure the distance between your nose and the bottom of your chin. Our size is suitable for adults over 12cm. And we also include 1 O-ring, 2 ear tips, and a mesh bag. Very convenient to carry. 🎀【Waterproof Design】When the breathing tube is submerged in water, the floating ball will float up and block the inhaling tube to prevent water from entering; When the breathing tube rises above the water, the floating ball will fall and open the inhaling airway so that you can breathe freely. 🎀【Anti-Fog and Leak-Proof】Separate inhaling and exhaling channels with anti-fog coating on the lens and anti-fog inserts, stop the top snorkel mask from fogging up, advanced leak-proof silicone sealing mask with floating ball prevents salty water from entering into swimmer’s mask. 🎀【Natural Breathing Underwater】The specially made full face snorkel mask lets you breathe with your nose and mouth. Forget about the discomfort, and enjoy the dive, breathing absolutely naturally. No special preparation and skills are needed. Everyone can dive using our diving mask. 🎀【180° Full Face Design】Our snorkel mask provides 180º Panoramic view, makes it easier than ever to breathe comfortably through your mouth or nose while you are snorkeling. You will see more fish and undersea world than ever before! With a detachable mount for the camera, you can easily connect your camera and capture the movement around you in a hands-free high-definition.