Hollis M1 Mask

This is the Hollis M1 Frameless Wide View Low Volume Scuba Diving Mask Features: Frameless 100% pure silicon skirt Saint-Gobain Diamant - Crystal Clear Lens Wide vision and low volume 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.