It combines a new buckles of essential design and hydrodynamic, adaptable to the models Cressi Ara, Pro Light and Frog, with a novel self-regulating strip elaborated in pure latex of high elasticity. Latex is the most elastic material of nature and has the property of being able to elongate up to 8 times its length without breaking and with total elastic memory, that is, recovering the initial length. It allows for a comfortable positioning versus flap attachment relationship, well above the spring systems, precisely because of its high elastic coefficient (X8 versus X1.5 of the spring).