This semi-dry snorkel comes fitted with a splash guard on top which is simply a guard that prevents splashed water and spray from entering the tube, reducing the need to forcefully clear the snorkel.
It also has a purge valve at the bottom - which is a sump area where any water that has come down the tube will collect (it is lower than your mouth and keeps water from entering your mouth). There is a little valve in this area, so that when you blow out it will clear water from the tube, instead of having to blow it all out the top - it takes much less effort.
The flexible part of the tube means the snorkel moulds around your face and head properly and, along with the soft silicone mouthpiece, ensures a comfortable fit.