The Backup That Became a Primary

I originally bought the Hollis M1 as a backup — something compact I could stuff in my BCD pocket and forget about until I needed it. Fast forward 80+ dives, and it's now the first mask I reach for. The frameless, ultra-low-volume design folds flat, weighs practically nothing, and delivers optical clarity that made all my other masks look like they had cataracts.

The Glass — It's Real

The Saint-Gobain Diamant Crystal Clear glass is the M1's killer feature. Standard tempered glass has a slight green tint — you don't notice it until you compare side by side. The M1's glass is optically clear, transmitting about 92-93% of light. Colors look more vibrant. Shadows have more detail. On a twilight dive in Amed, I could see color details on nudibranchs that my buddy with a standard mask couldn't see at all.

This isn't marketing hype. Low-iron glass removes the green tint that makes the underwater world look slightly muted. If you're into underwater photography, this mask is practically essential — it reduces the visual fatigue from trying to compose shots through a tinted window.

Fit & Seal

The double-feathered edge silicone skirt is remarkably pliable. It conforms to face shapes that other masks struggle with. Several dive buddies with significant facial hair who can't seal most masks — the M1 works for them. The nose pocket is larger than average, making equalization a breeze. Minimal mask squeeze even at 30m+, and clearing is instantaneous.

One caveat: if you have a larger nose, you may feel some pressure on the underside during descent. Not painful but noticeable. Some divers resolve this by slightly repositioning the mask. The frameless design means the skirt does the work — for most face shapes this means better seal, but it can create pressure points for unusual geometries.

Practicality

The M1 folds completely flat. I keep one in my BCD pocket and forget it's there until needed. Buckles adjust smoothly even with thick gloves. Wide split strap distributes pressure evenly without pulling hair. The all-black aesthetic is clean but disappointing if you want color options — this mask only comes in black.

Value Proposition

At ~$125, the M1 sits in a sweet spot. More expensive than budget masks but dramatically undercuts premium masks with similar optical quality (Atomic Venom, etc.). For any diver who cares about seeing clearly underwater, the optical quality alone justifies the price.