This ultra low volume mask is designed to fit the needs of scuba divers and freedivers; if you partake in both activities, this scuba mask has the best qualities for scuba diving and freediving. The Sopras Sub SFERICA mask has a narrow bridge separating its curved lenses to provide a true 180 degree range of visibility. Its super sleek design reduces drag while swimming. Features: very similar to Aqualung Sphera Slim mask strap and buckle design minimize drag and are easily adjustable