Hollis M-1 Dive Mask Black — Frameless Low-Volume Scuba & Snorkel Mask, Ultra-Clear Low-Iron Glass

The Hollis M-1 Mask is a frameless, low-volume dive and snorkel mask with ultra-clear glass that maximizes color fidelity and minimizes distortion underwater.

Designed for divers and snorkelers who prioritize visual clarity, the M-1 combines a Saint-Gobain Diamant lens with a 100% pure silicone skirt to deliver a wide field of view, comfortable fit, and excellent light transmission. The low-iron glass reduces the green tint common in standard lenses so colors appear truer and visibility improves in dim or greenish water. Its frameless design lowers internal volume, making it easy to clear and comfortable to wear under hoods or for travel.

How does the M-1 improve underwater visibility?

The M-1 uses ultra-clear, low-iron glass from Saint-Gobain Diamant, which increases light transmission and reduces the green cast typical of ordinary lenses. This results in a cleaner, more natural color palette and crisper detail at depth and in low-light conditions. The mask’s optical design also minimizes distortion across the viewing area so objects retain their true shape and position.

• Saint-Gobain Diamant lens for higher light transmission
• Low-iron glass to reduce green tint and enhance color accuracy
• Distortion-minimizing lens geometry for truer shapes
• Wide-vision layout to broaden peripheral sightlines

What comfort and fit features does the M-1 offer?

The M-1’s frameless construction pairs with a 100% pure silicone skirt that conforms to facial contours, reducing pressure points and creating a reliable seal. The low-volume profile keeps the mask close to the face for easier equalization and makes it suitable for travel. Adjustable strap mounts allow quick tuning of fit without changing the skirt position.

• Frameless design for reduced bulk and low internal volume
• Pure silicone skirt for softness and secure sealing on many face shapes
• Quick-adjust buckles for fast strap changes
• Compact profile compatible with hoods and tight-fitting gear

How does the M-1 perform for snorkeling and diving in variable conditions?

The M-1 is engineered to deliver consistent performance whether you’re surface-snorkeling, freediving, or scuba diving. A wide field of view and clear optics help you identify features, marine life, and gauges more easily. The mask also integrates practical features for water management and clearing when needed.

• Wide-vision lens arrangement for broader peripheral awareness
• Low-volume shape eases clearing and equalization
• Large purge valve for fast water evacuation
• Completely dry top snorkel (if used with compatible snorkels) to reduce surface water entry

How durable and travel-friendly is the M-1?

Built with durable materials and a compact, frameless layout, the M-1 packs easily and resists everyday wear. The tempered Saint-Gobain glass is robust against impact and scratching while the silicone skirt retains flexibility even after repeated use. Its slim profile reduces case space and makes it a convenient choice for dive trips and carry-on luggage.

• Tempered Diamant glass for strength and scratch resistance
• Silicone skirt that stays flexible over time
• Low-profile design fits inside small dive bags and cases
• Simple maintenance — rinse, dry, store

Who is this for? The Hollis M-1 Mask suits snorkelers, freedivers, and scuba divers who want superior optical performance without added bulk. Choose the M-1 if you want truer color rendering, a close low-volume fit, and rugged components that travel well. It’s a strong option for divers who value visual detail—reef photographers, underwater naturalists, and anyone who spends time in low-light or green-tinted waters will find the M-1 especially beneficial.