Ask an instructor what most often ruins a beginner's dive and you will not hear cold, or current, or visibility.
It is the mask.
A mask that leaks slightly means you are clearing it every two minutes, water is running into your eyes, and your attention is on your face rather than on anything around you. It is a small problem that consumes an entire dive — and it is completely fixable in ten minutes at a shop.
Why the mask comes first
Of everything in diving, the mask is:
- The cheapest significant item
- The most personal — fit depends on your face shape, and no two are the same
- The most damaging when wrong
- The one rental gear is worst at, because rental masks fit whoever used them last
Buy this before your course. Everything else can wait.
The fit test
This takes fifteen seconds per mask and it is the only test that matters.
- Hold the mask to your face. Do not use the strap — let it hang behind.
- Look slightly downward, in a natural head position rather than tilted back.
- Inhale gently through your nose.
- Let go.
A mask that fits stays on your face by suction alone, with no hand holding it.
A mask that falls, or where you feel air trickling in around the edge, does not fit you. It does not matter how good it is, how much it costs, or how much you like the colour.
Check these too
Where the strap sits. Around the widest part of the back of your head, not high on the crown. A strap that rides up pulls the mask off your face.
Whether you can pinch your nose. You will do this to equalise, wearing gloves, at depth, without looking. The nose pocket must let you.
The skirt against your face. Look for gaps at the temples and under the eyes. Deep smile lines, a moustache or an unusual bridge shape can all break the seal.
Facial hair. A moustache will usually leak. Options: shave it, trim the very top row of hairs where the skirt sits, or use silicone grease along the skirt line. All three work; the last one is what most bearded divers actually do.
What actually matters in a mask
Skirt material
Silicone. Soft, seals well, lasts. This is what you want.
Clear silicone lets in more light and feels more open. Black silicone cuts glare and reflection, which photographers prefer. This is preference, not quality.
Volume
Low-volume masks hold less air inside. Advantages: less to clear if it floods, less squeeze on your face at depth, sits closer to the eyes.
Generally preferable — but fit beats volume. Always.
Lenses
Tempered glass, and it will say so. Never plastic.
Single lens or twin lens is preference. Twin-lens masks can take corrective lenses more easily, which matters if you wear glasses.
Side windows add peripheral light. Some divers like them; some find they add distortion.
Buckles
Side buckles mounted on the skirt rather than the frame flex better and let the mask sit more naturally. Easy adjustment while wearing gloves is worth having.
What does not matter
Price. Above the very cheapest tier, more money buys features and finish, not fit. A mid-priced mask that fits your face beats an expensive one that does not, every single time.
Brand. Different manufacturers happen to suit different face shapes. Yours is whichever one seals.
Colour. Beyond the clear-versus-black skirt question, no.
Buying online. This is the actual trap. You cannot fit-test a photograph, and the fit test is the only thing that matters. Buy the mask in a shop where you can try it.
Prescription options
If you wear glasses, three routes:
Contact lenses under a normal mask. Common and effective. Soft lenses preferred. Practise mask clearing with your eyes closed.
Corrective lenses in the mask. Many twin-lens masks accept off-the-shelf corrective lenses in common strengths. Custom-ground lenses handle more complex prescriptions and astigmatism.
Nothing. Water magnifies by roughly a third through a mask, which partially compensates for mild short-sightedness. But if you cannot read your computer, sort out the correction — that is a safety issue, not a comfort one.
More in glasses, ears, asthma, age.
Preparing a new mask
This step is skipped constantly and then blamed on the mask.
New masks ship with a manufacturing film on the inside of the lens. It fogs relentlessly until removed.
To remove it: scrub the inside of the lens firmly with non-gel white toothpaste (or a dedicated mask cleaner), rinse, and repeat. Two or three times. Some people use a lighter flame carefully on the glass — effective, and easy to damage the skirt with, so toothpaste is the safer advice.
Before every dive after that: anti-fog gel, or a drop of diluted baby shampoo, or spit. All work. Rinse lightly, do not flood it.
Looking after it
- Rinse in fresh water after every dive, including the buckles
- Dry out of direct sunlight — UV degrades silicone
- Store in a box, not squashed at the bottom of a bag
- Keep it away from neoprene and rubber during long storage
A good mask lasts many years. The strap will perish before the mask does, and straps are replaceable.
What to buy next
Once the mask is sorted, the sensible order is snorkel and boots, then fins after about ten dives, then a wetsuit, then a computer before you start deep diving.
The full order and what to rent versus own is in buying dive gear in Lebanon, and what thickness of suit you need here is in wetsuits for Mediterranean water.
