COOL FACTOR With the Favola, anyone can enjoy the freakish benefits of being double jointed. New buckles give more flex and a better fit. key features All the elements for a low-volume mask are here: teardrop-shaped glass, angled lenses and a low-profile skirt. To that, Aqua Lung has added a new double-jointed buckle that flexes both up and down and side to side and a squeeze-button tension-release system that takes the pain out of mask adjustments.