For the past six years Seadive/Oceanways has developed and field tested, anti-reflective (ARC) mask coatings of tempered glass. Seadive/Oceanways ARC coatings now allow almost 100% transmission of light. Standard tempered glass has a minimum of 4%-plus rate of reflection which can seriously distort underwater vision. Only Seadive/Oceanways has licensed application and laboratory fabrication. Only Seadive/Oceanways has six-plus years of dealer/customer satisfaction. Only Seadive/Oceanways offers Rayblock fog-free lens masks. XS Scuba’s Seadive Rayblock SeaDiver HD Mask provides the Best overall for any and all diving/snorkeling conditions”. The lenses reduces harmful UV/glare, surface grit in eyes and provide overall greater clarity. When you come up for a dive the lenses provide quick vision-return from surface making this the instructor’s choice in mask design. The Rayblocker SeaDiver HD Mask low volume design prolongs the need for equalizing and allows for easy clearing. This mask is best suited for divers with medium to medium large faces. The buckles of the mask are positioned directly on the skirt minimizing weight and reducing drag. The XS Scuba Rayblocker SeaDiver HD Mask has tempered glass lenses, a high quality silicone skirt and head strap. The mask skirt is a double feathered edge design and the wide split style head strap combined for a comfortable and excellent seal on the face. The mask is equipped with a large easy to reach one-hand nose pocket for ear equalization. Mask has easy adjust strap buckles and comes with a mask box.