TUSA 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. Expanded panoramic view through 1-window lens. New Design - Patented domed side windows. Reduced frame structure to reduce blind spots. Equipped with Freedom Technology. Three-dimensional strap for unprecedented fit. Five-position strap angle adjustor for micro-adjustment.