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. The Fabric Mask Strap adds a new level of comfort to the dive experience. Anti-slip grip and easy adjustment ensures a snug fit to the back of the head. The snorkel keeper ensures secure placement. Fabric Strap Features: Easy size adjustment. Anti-slip on the back of the head. With snorkel holder. Head Circumference Size: 500-650mm. Material: Polyester and Nylon. Mask Features: NEW 3D SYNQ. NEW Swift Buckle 3D. Freedom Dry Technology. Round Edge Skirt. NEW Eco-Friendly mask case that is made from recycled material. Corrective Lens available: MC-211