Hollis M-1 Frameless Mask Instruments So fast and responsive they're

So fast and responsive they're scary

) for simple dive/pre-dive adjustment

The Biolite looks to establish itself as a complete solution with a color design and streamlined

They are popular because they work

Hollis M-1 Frameless Mask Instruments So fast and responsive they'reThis 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