Aqualung Sphera Freediving Mask $49 Aqualung Sphera Freediving Mask Dubbed as one of the best freediving masks in the market, Aqualung Sphera grabs your attention at first glance with its snug fit and sleek design. Aqualung boasts of the mask’s twin Plexisol® lenses separated by a narrow bridge that provide 180-degree visibility – a vista that no other freediving mask can offer. Its soft silicone skirt, slim strap, and minimalist buckles make the mask comfortable and easy to adjust. It also lessens underwater drag and has a low internal volume – a huge plus for freedivers. With all these factors, it can be argued that Sphera is THE BEST freediving mask – one that can definitely maximize your underwater experience.