I dive for a few years now and am very regular snorkel training. Especially in my early days I have tried different snorkel and then I eventually ended up in the "Air silicone valve". What can I say: I dive and snorkel now for six years with this snorkel. It was used in the sea, lake and in the indoor pool and has always been my Met or exceeded expectations. Important details is z. B. the rotating splashguard or the removable mouthpiece. The airflow management is exemplary. For me personally, the "Air" the snorkeling is absolutely !!!!