The Holy Trinity of Scuba Gear: Mask, Fins, and Snorkel

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When you initially start your Open Water Course, the dive centre will reliably provide all the heavy, highly expensive gear (BCDs, regulators, heavy tanks, and lead weights). However, almost every professional instructor will strongly recommend that you purchase your own “Holy Trinity” as soon as possible: your personal mask, fins, and snorkel.

Renting a wetsuit that is a little loose is merely annoying; renting a mask that constantly leaks salt water into your eyes will entirely ruin your dive. Here is a comprehensive guide on how to buy the absolute essentials.

1. The Scuba Mask

The mask is unquestionably the most intimate, critical piece of gear you will own. If it doesn’t fit perfectly and seal flawlessly, absolutely nothing else matters.

Fit is Everything

Do not buy a mask online simply based on how it looks or what color it is. You must go to a physical local dive shop and try them on.

• The Sniff Test: Place the mask gently against your face without pulling the rubber strap over your head. Inhale slightly through your nose and let go with your hands. The mask should stick firmly to your face and stay there. If air visibly leaks in around your temples or under your nose, it will leak underwater. Try a different model.
• Silicone Skirts: Ensure the skirt (the soft, flexible part touching your face) is made of 100% medical-grade silicone. Cheap plastic skirts (often found in supermarket snorkel sets) quickly harden over time and leak profusely.
• Clear vs. Black Skirts: Clear silicone skirts let in significantly more peripheral light, which is great for nervous beginners who feel claustrophobic. Black silicone skirts actively reduce annoying surface glare, which is highly preferred by underwater photographers.

Pro Tip: Brand new dive masks inherently have a stubborn silicone residue left on the glass from the manufacturing process. This will actively cause the mask to fog relentlessly on every dive, no matter how much spit or expensive commercial defog gel you use. You must scrub the inside of the dry glass aggressively with regular white toothpaste for 5 solid minutes before your first dive to remove this chemical film!

Insider Pro Tip: When performing the toothpaste scrub on a new mask, you must use basic, cheap, non-whitening white paste. Do not use gel toothpaste (it entirely lacks the mild abrasives needed to remove the silicone film) and absolutely do not use specialized whitening toothpaste (the harsh, gritty abrasives can permanently scratch the tempered glass).

2. The Fins

Fins are your primary underwater engine. The right pair will allow you to easily glide effortlessly through the water; the wrong pair will quickly give you crippling calf cramps and exhaust your air supply.

Open Heel vs. Full Foot

• Open Heel (Adjustable Strap): These require you to also wear thick neoprene booties. They are the absolute standard for cold water diving and rugged shore diving (like in Bonaire), as the thick booties heavily protect your bare feet when walking over sharp rocks to enter the water.
• Full Foot: These slip on directly like a shoe over your bare feet. They are generally lighter, cheaper, and strictly designed for warm water boat diving (like in the calm Gili Islands).

Blade Types

• Paddle Fins: The traditional, somewhat stiff plastic/rubber blade design. They offer massive propulsion power and are excellent for fighting heavy currents, but they require strong leg muscles to avoid fatigue.
• Split Fins: These have a distinct slice down the middle and work somewhat like a boat propeller. They require a much faster, fluttering kick and are very gentle on the knees, though they completely lack pushing power in strong, sweeping currents.

For your very first pair, a standard, moderately stiff open-heel paddle fin (like the legendary Mares Avanti Quattro) is almost universally recommended by experienced instructors.

3. The Snorkel

Snorkels are arguably the most debated piece of standard scuba gear. Many highly experienced divers actively hate having a bulky snorkel permanently attached to their mask because it creates drag and can easily get tangled in kelp or lines. However, all major training agencies mandate their use for safety during long surface swims.

If you are buying one for your first set of gear, keep it as simple as possible:

• Dry/Semi-Dry Snorkels: These feature highly complex valves at the top and bottom designed to keep water out. They are bulky, heavy, and drag terribly underwater. Actively avoid them if you are primarily scuba diving rather than surface snorkeling.
• The J-Tube: The classic, extremely simple hollow plastic tube. It is cheap, lightweight, and perfectly adequate for the short surface swims required in standard scuba diving. Many modern versions can even be rolled up completely and stuffed safely in your BCD pocket when you descend!