Zensee PRO is TUSAs first frameless diving mask with all of our innovative features plus Anti-Reflective lens treatment, UV 420 Lens treatment and our superior CrystalView optical lens. UV 420 Lens Treatment - Protects against harmful high-energy visible (HEV) light. CrystalView Optical Lens - Provides superior clarity, color and transmission of light. Anti-Reflective (A/R) Lens Treatment - Anti-reflective coating enhances overall vision. Anti-Fog Film - Durable, long lasting material to greatly improve visibility by preventing mask fogging. 3D SYNQ - A unique Fitting Ring built into the Mask Skirt providing an ideal fit for all face shapes. Swift Buckle 3D - A new low-profile buckle and mask strap for smooth effortless adjustments. Freedom Technology/Freedom Dry - Enhances comfort and fit by utilizing a revolutionary low friction skirt surface. 3D Mask Strap - TUSAs unique 3D design contours to the shape of your head. Round Edge Skirt - Round edge skirt improves both seal a