It is a feedback tool

This can help remove empty space

Does the case have locks

The result is a comfortable freediving mask for pool training

Molchanovs - Bifin Blade Protection rental It is a feedback toolMolchanovs Bifin Blade Protection The Molchanovs Bifin Blade Protection consists of a pair of removable protective tips for your bifins. They enclose the delicate blades between two lightweight, polycarbonate sheets that are encased in water resistant Oxford fabric, with additional tip reinforcement to protect the most fragile part of the blade. Tabs placed at the top of the protectors make for easy insertion of the bifin blade and three velcro strips