Tried it quickly but it really does not leak in in case some water goes inside still wont go to your nose or mouth eyes it is collected on the bottom and when you lift up your head above water the excess water inside comes out on the 1 way opening near the mouth so you dont even have to play the usual tricks like holding the mask and blowing air from your noseand if did not work you have to come up and lift the mask to release the water just lift up your head and the water flows outu can breath trough your nose which is more natural but there is some pressure difference while in water so breathing only trough your nose is not enough have to breath trough your mouth as wellbit weird when you go fully under water it will block the water out with a ball filled with air suddenly you cant breath until you come up if you are not expecting the go fully under water but the traditional way would allow the water to go in you lungs so it is still betterfeels bit loose but when you are under water it will push against your face properlyi hate the salty taste of the sea water with the traditional mask pipe you need to insert that fully into your mouth which gives you a very salty taste and almost makes me puke with this you dont need a separate pipestill fogging but much better controlled that traditional the nose part is kinda separated so you breath out almost directly to the pipeoverall very good product way much better than tradition stuff