This is not "a common Jacket" because this is "THE JACKET". It has been planned and made to be high hydrodynamic and to offer great sturdiness. Recently the 747 has been improved and until now is considered one of the best BCD in the world. A steady research of hi-tech materials give to the 747 the best performance. We use Platilon to build the inflating bag and the external tissue is an high-shock nylon called Microns 1000. On the back you can find two separate tank-belt with steel safety locks to ensure a perfect grip of every size of cylinder. At last the BCD control IN-OUT at the moment considered the best pneumatic control that guarantees inflation e deflation without rising the arm. * perfect wearability guarantee by the slide of the inside inflating bag that avoid strong pressure on the chest when it inflates * comfortable because of the soft back with double tank iron lock fit each type of cylinder Size: XS-S-M-L-XL-XXL Available colours: black-silver-blue royal-blue navy-pink yellow-green