With years of research, TUSA has developed a mask skirt that adapts to your face. The 3D SYNQ Fitting Ring adapts to the user's face creating a seal like no other mask. Large or small, wide or narrow, long or short, the TUSA Intega has you covered. Features: 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. Round-edge skirt - Round edge skirt improves both seal and comfort of the mask. Corrective Lens available