Hollis M1 Onyx Mask.
Visibility is the most important aspect of any dive. The
M1 Mask raises the bar for optical quality and distortion free vision.
This lens is an extra clear glass which 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
glasses. This makes the lens distortion free and helps improve color
and visibility in low light conditions underwater.
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