The M3001 Freedom Tri-Quest Mask features Freedom Technology with newly designed patented domed side windows and an expanded panoramic view through a 1-window lens. The Tri-Quest Mask has a reduced frame structure to reduce blind spots and a three-dimensional strap for an unprecedented fit. Features: Expanded panoramic view through 1-window lensNew Design - Patented domed side windowsReduced frame structure to reduce blind spotsEquipped with Freedom TechnologyThree-dimensional strap for unprecedented fitFive-position strap angle adjustor for micro-adjustmentTechnology: FREEDOM TECHNOLOGY: Freedom Technology is a set of technologies to enhance fit and performance exclusive to TUSA. Freedom model masks feature a dimpled skirt surface with varied silicone thicknesses and stability ridges in addition to a proprietary low-friction skirt surface on the fitting line. Read more3D MASK STRAP: TUSA?s patented 3D Strap is a true three-dimensional design that snugly fits against the head?s natural curvature. The 3D strap offers unprecedented comfort and fit, unlike standard flat mask straps.CRYSTALVIEW OPTICAL GLASS: CrystalView optical glass lenses provide superior clarity, color, and transmission of light over standard glass lenses used by the competition. Up to 15% of available light can be lost with a standard glass lens due to impurities and reflectivity. TUSA?s CrystalView lenses transmit up to 95% of available light to the diver for clear crisp vision. CrystalView lenses are used in all PRO models masks. Read morePANORAMIC VIEW: Panoramic View masks feature a variety of designs offering an incredibly wide field-of-view. Several designs incorporate minimum frame volumes, domed side-windows, reduced frame structures as well as three and four window styles for maximum vision.QUICK-ADJUST BUCKLE SYSTEM: The Quick-Adjust Buckle System incorporates a newly-designed low-profile buckle. The result is a compact, lightweight, technologically advanced mask design that can be easily and quickly adjusted for a perfect fit.ROUND EDGE SKIRT: TUSA's Round Edge Skirt features a proprietary round edge cross-sectionally shaped skirt. This rounded edge results in a soft fit that suppresses pressure and reduces creasing left on the face. The "planar fit, instead of linear fit" silicone skirt maintains great fit and unprecedented comfort.