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.

Wide vision and low volume. Saint-Gobain Diamant - Crystal Clear Lens. Frameless 100% pure silicon skirt.

Number of Windows: 1. Frame Material: Silicon. Age Range (Description): Adult. Item Weight: 0.3 Pounds. Lens Type: Single Lens. Sport Type: Snorkeling. Brand: Hollis. Color: Black. Material: Silicone. Date First Available: February 8, 2009. Best Sellers Rank: #29,701 in Sports & Outdoors. Customer Reviews: 4.5 out of 5 stars 532 ratings 4.5 out of 5 stars. : B00361V0RW. Sport Type: ?Snorkeling. Part Number: ?205-4500-07. Manufacturer: ?Hollis. Number of Items: ?1. Material: ?Silicone. Color: ?Black. Brand Name: ?Hollis. Item Weight: ?0.3 Pounds. Item Dimensions LxWxH: ?4 x 2 x 3 inches. Package Weight: ?0.38 Kilograms. Item Package Dimensions L x W x H: ?8.54 x 4.57 x 4.33 inches.