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                      Mask 
                  In order to clearly see underwater, it is necessary to have airspace between
                  your eyes and the water around you. Masks employ lenses made from tempered
                  glass. It is also possible to have prescription lenses made for your mask.
                  Also, your nose always needs to be contained inside the airspace area of
                  the mask, so swimming goggles are not suitable for diving. To choose the
                  best fitting mask, we hold it to our face, lightly inhale using our nose,
                  and release our hold to see if a firm seal can be maintained. The field
                  of vision should be as wide as possible. For its ability to fit well and
                  to keep out water as well as its durability, silicon rubber masks are popular. 
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                        2-Lense Mask 
                        
                         
                        1-Lense Mask 
                        
                         
                        Multifaceted Mask 
                   
                   
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