WHY USE A NOSE CLIP RATHER THAN A MASK?
The nose clip is used to equalise the ears without needing to use your hands, for increased fluidity and better concentration.
Unlike a mask, it facilitates the diving reflex, which starts to take effect as soon as the face (and the eye area in particular) comes into contact with cold water. This triggers a natural response in the body which helps with freediving.
The nose clip is used for dynamic (in the swimming pool), static and deep (in the sea or diving pool) freediving.