The Cressi Z1 Frameless Diving Mask is a frameless mask that boasts a low internal volume while offering a wide field of view in all directions. The specific design uses the assembly of the silicone skirt directly over the single glass. This system guarantees great sturdiness and a perfect watertight seal. The lower weight of the mask makes it ideal for travel. The flexible fit and reduced drag are appreciated for freediving and spearfishing, snorkeling, and diving. The buckles are completely tiltable allow immediate regulation of the strap length with 1 hand. The anchoring of the buckle system on the mount prevents deformation of the silicone facial during the use of the maskunlike ordinary models that anchor the buckles on the facial itselfand the tension of the strip aligns with the plane of the glass, optimizing the level of proximity of the eye/lens to the user's taste and the volume and optimal visibility of the mask. Mfrs. 2-year limited warranty.Manufacturer model #: DN4100. Great sturdiness and watertight seal Flexible fit Tiltable buckles Optimized proximity of eye and lens to user preference Optimal mask visibility