Cressi SF1 Squared Frameless Scuba Diving Mask

Cressi SF1 Squared Frameless Mask: A Low-Volume Frameless Mask Built for a Clean, Reliable Fit

The Cressi SF1 Squared Frameless Mask is a single-lens, frameless dive mask designed for recreational divers who want a compact, low-profile fit without giving up a wide field of view.

If you are a certified diver looking to move past a basic entry-level mask, or if you have been borrowing gear and are ready to own something that actually fits your face well, the SF1 is worth a serious look.

What "Frameless" Means for You

Most masks have a rigid plastic frame that holds the lens and connects to the skirt. A frameless mask removes that frame entirely. The silicone skirt bonds directly to the lens.

This does a few useful things. The mask sits closer to your face, which reduces internal volume. Less air space inside means less effort when you need to clear water out of the mask by exhaling through your nose. It also means the mask packs flat and light in your bag.

The SF1 takes this a step further with a squared lens shape rather than the rounded teardrop you see on many frameless masks. That squared geometry pushes the lens wider toward the sides, giving you a broader horizontal view than a narrower oval lens would.

The Skirt and Seal

The skirt is made from flexible silicone with a double feathered edge, meaning the rim that contacts your face tapers to a very thin, soft lip rather than ending in a blunt edge.

That thin edge conforms more easily to the contours around your nose and cheeks, which is especially useful if your face does not fit the standard mold. Cressi describes the SF1 as fitting most face shapes, and the feathered edge design is a real part of why that tends to hold true.

The silicone is described as shiny rather than matte, which is a cosmetic detail, but it also signals a slightly stiffer silicone compound. This is not a problem for most divers, but if you have very sensitive skin or a particularly unusual face shape, it is worth knowing before you buy.

Lens

The SF1 uses a single front-facing tempered glass lens. Tempered glass is standard on quality dive masks for a reason: it is far more resistant to pressure and impact than ordinary glass, and if it does break, it shatters into small blunt pieces rather than sharp shards.

A single lens gives you an unobstructed central view with no dividing bar running down the middle. The trade-off is that single-lens masks cannot be fitted with prescription lenses the way some twin-lens masks can. If you need optical correction underwater, the SF1 is not the right choice.

Buckles and Strap

The buckles are mounted directly on the skirt rather than on a frame, which keeps the profile low and reduces the number of rigid parts pressing against your head.

Adjustment is micrometric, meaning the strap moves in small, precise increments rather than jumping between fixed positions. You can dial in the tension without over-tightening, which matters because a mask that is too tight is actually more likely to leak than one set at the right tension.

The strap itself is a wide split style, which distributes pressure across a broader area of the back of your head and helps keep the mask from rotating or slipping during a dive.

Nose Pocket and Equalization

Equalization, pressing your nose and blowing gently to relieve pressure in your ears as you descend, requires you to reach into the mask's nose pocket with your fingers. The SF1's nose pocket is described as large and easy to reach.

On some low-volume masks the nose pocket is tight or awkwardly shaped, which makes equalization fiddly. A generous pocket is a practical detail that divers with larger hands or thicker gloves will appreciate.

What Comes in the Box

• Cressi SF1 mask in your chosen color
• Protective hard box for storage and travel

The hard box is a small but genuine convenience. Masks stored loose in a bag get scratched and warped. Having a dedicated case means the SF1 arrives and stays in usable condition.

Who This Mask Is Not For

If you need prescription lenses, look at a twin-lens mask instead, as those can be fitted with corrective lenses.

If you dive primarily in cold water and wear a thick hood, the feathered skirt edge can sometimes have trouble sealing cleanly against neoprene. Not a dealbreaker, but something to be aware of.

And if you prefer a very soft, matte silicone feel, the SF1's shiny silicone may feel slightly firmer than what you are used to.

The Short Version

The Cressi SF1 Squared Frameless Mask is a well-thought-out mask for recreational divers who want low volume, a wide view, and a reliable seal across a range of face shapes.

The frameless build keeps it light and packable. The squared lens maximizes what you can see. The micrometric buckles let you get the fit right without guessing. None of these are gimmicks; they are practical design choices that add up to a mask that does its job without getting in the way of your dive.