This is the IST MP201 Proteus Low Volume Scuba Diving and Snorkeling Mask Features: Varied-thickness construction Hypoallergenic skirt is soft yet it will not yield due to increased pressure and depth The nose pocket is easily accessible irrespective of the thickness of the gloves used The MP201 has a larger field of vision compared to its cousin the Bluetech (M88). Despite the increase, the internal volume remains small because the lenses are brought closer to the eyes The strap buckles are attached directly to the skirt (not the frame, unlike some designs) so they will not interfere with fitting, especially when it comes to people with wider facial profile PROTEUS is one of the best masks IST makes to date. It does not just perform everything a dive mask should; it does it with comfort and more.