The Hollis M1 Dive Mask. Designed to prioritize visibility, this mask sets a new standard for optical quality and distortion-free vision. The lens is crafted from extra clear glass, renowned for its attractive appearance and superior optical properties. With low iron content, the lens boasts higher light transmittance and minimal green tint compared to standard glasses, resulting in a distortion-free view that enhances colour and visibility, even in low light conditions beneath the surface.