The X-VU 2-Lens Mask uses Tri-Comfort Technology. Tri-Comfort Technology is accomplished with small horizontal ribs between the frame and the skirt in the area around the nose. These Ribs Absorb and Redistribute the Pressure Exerted by the Frame onto the Mask Skirt, with a resulting Increase in Comfort. Beyond the Natural Comfort provided by Tri-Comfort Technology, this Masks Reverse Tear-Drop Tempered Safety Glass Lens Design provides a Superior Field of Vision. This Low Volume Mask has a Double Feathered Edge Silicone Rubber Skirt that teams up with the Unique X-Shape Silicone Rubber Strap. Both of these features improve the overall Fit of the Mask. The X-VU has an Easy to Reach Nose Pocket that allows One-Handed Ear Equalization even when wearing gloves The X-VU Mask comes with a Mask Box and is covered by a 24 month limited warranty.