Hollis M-1 Frameless Mask Instruments the textured sole provides traction

the textured sole provides traction on boat decks and other slick surfaces

Safety Red Color Coded Indicators from 0' to 30' and 130' to 200'

Removable inflator valve backer pad reduces discomfort as a result of the “squeeze” at depths

So fast and responsive they're scary

and Japanese

Hollis M-1 Frameless Mask Instruments the textured sole provides tractionThis products Overview Visibility is the most important aspect of any dive. The M1 Mask raises the bar for optical quality and distortion free vision. The extra crystal clear Saint Gobain Diamant tempered glass single lens is valued for its attractive appearance and optical qualities. The low iron content produces a higher light transmittance and a reduced green tint inherent in other glass. This makes the lens distortion free and helps improve color