Freediving Wetsuits for Indian Waters: Thickness, Cut and Fit

For most freediving in Indian waters, where sea temperatures at popular sites are commonly around 26–30°C, a freediving wetsuit between 1.5 mm and 3 mm thick is the usual choice. Go thinner for short, shallow sessions in the warmest months and thicker if you feel the cold, dive deep or spend long hours on the line. A typical freediving suit is a two-piece with an attached hood, often made of open-cell neoprene that seals against your skin, which makes it noticeably warmer than a lined surf or scuba suit of the same thickness.

Water temperatures vary with season, region and depth, so treat every number here as typical rather than guaranteed, and ask local instructors before a trip.

Why wear a wetsuit in warm water at all

New divers in the Andamans sometimes ask why anyone would wear neoprene in water that feels like a bath. A few reasons:

• Heat loss. Water draws heat away from your body around 25 times faster than air. A two-hour line session involves a lot of floating still during breathe-ups and recovery, and even 28°C water slowly cools you.
• Thermoclines. Water at depth can be noticeably cooler than at the surface.
• Cold costs oxygen. Shivering and tension raise oxygen use, tighten your chest and make equalising harder.
• Sun. On a line session your back and the backs of your legs sit at the surface under tropical sun for hours.
• Stingers and scrapes. Neoprene protects against jellyfish and other stingers, fire coral, the line, rocks and boat ladders.

A rash guard or thin lycra suit covers the sun and stinger problem for short, shallow snorkels. For proper freediving sessions, most people end up wanting some neoprene.

Open-cell vs lined neoprene

Neoprene is a foam rubber full of tiny gas bubbles. Freediving suits differ mainly in what’s on the inside surface.

Feature	Open-cell (raw neoprene inside)	Lined (fabric inside)
Warmth	Warmer for its thickness; seals to your skin so little water flushes through	Less warm; water can circulate between suit and skin
Flexibility	Very stretchy and easy to breathe in	Stiffer
Putting it on	Needs a lubricant, usually soapy water	Slides on dry
Durability	Delicate; fingernails, Velcro and rough handling tear it	Tough and forgiving
Best for	Regular training, depth, long line sessions	Beginners, rental, rocky entries, heavy boat use

The outside matters too. Smooth-skin outer surfaces are slick and hydrodynamic but scratch easily. Fabric-covered outers are tougher, come in more colours and patterns, and cope better with rough boat trips and rocky shores. Many freediving suits combine an open-cell inside with either kind of outside.

What wetsuit thickness for Indian waters?

Conditions	Typical choice
Very warm water (about 29–30°C), short, shallow sessions	Rash guard or lycra, or 1.5 mm
Warm water (about 27–29°C), a normal 1–2 hour training session	1.5–2 mm, or 3 mm if you run cold
Cooler spells (about 25–27°C), long depth sessions, thermoclines	3 mm
Trips to cooler destinations abroad	3–5 mm; check local advice for the season

Your body matters as much as the water. Lean divers, divers who are new and tense, and anyone doing long sessions tend to want more neoprene. If you’re buying one suit for most Indian diving, 2–3 mm is a reasonable middle ground. The best time for freediving in India covers how conditions change through the year.

Thickness also changes buoyancy. A thicker suit floats you more at the surface, and because its neoprene bubbles compress with depth, it loses more of that float as you go down. Changing suits means re-checking your weights; see weighting for freediving.

The cut: why freediving suits are two-piece with a hood

Most freediving wetsuits come in two pieces:

• High-waisted trousers (often called a long john) that come up over the stomach and lower back.
• A hooded jacket, usually with a tail or crotch strap, sometimes called a beavertail, that fastens between the legs.

This gives you a double layer over the torso, where you lose the most heat, with no gap at the waist. The attached hood keeps your head warm and stops water flushing down your back. Many open-cell suits have no zip at all, because zips leak, stiffen the suit and add bulk.

Shorties and one-piece back-zip suits are fine for snorkelling and shallow fun dives in very warm water. They’re less warm for their thickness and let more water through.

Getting the fit right

A wetsuit only works if it fits closely. Water trapped in loose areas gets flushed out and replaced with every kick.

1. Snug everywhere. No baggy patches at the lower back, armpits, crotch or behind the knees.
2. Breathe fully. Take your biggest breath in the jacket. If your chest feels restricted, it’s too tight; a full, relaxed breath matters more than a perfect seal.
3. Check the face seal. The hood shouldn’t choke you or press hard on your jaw.
4. Move. Raise your arms overhead in a streamline and fold into a duck-dive position.

Off-the-shelf suits use size charts based on height, weight, chest and waist. Made-to-measure suits are cut from your own measurements, which helps if you’re between sizes or have a build that standard charts don’t suit. Since most of us end up buying online, buying freediving gear in India covers the practical side.

How to put on an open-cell suit without tearing it

1. Make your lubricant. Fill a 1-litre bottle with water, add a small squirt of mild shampoo or hair conditioner, and shake.
2. Take off rings and watches, and keep your fingernails short.
3. Pour some of the mixture into the trousers and over your legs, then slide them on.
4. Repeat for the jacket, pouring the mixture into the sleeves and over your arms and shoulders.
5. Handle the suit with the pads of your fingers, never your nails, easing up small sections at a time.
6. Gear up close to entry time. In a black suit on a sunny boat deck in the Andamans you can overheat surprisingly fast, so pour seawater over yourself if you have to wait.

To take it off, flood the suit with water first and it peels away far more easily.

Caring for your freediving wetsuit

• Rinse inside and out in fresh water after every dive day.
• Dry it in the shade, inside out first and then the right way out. UV hardens neoprene and fades colour.
• Hang it on a broad hanger or fold it over a bar, never by the hood.
• During the monsoon, make sure it’s completely dry before you put it away, or it will go mouldy. Store it loosely rather than crushed in a bag.
• Repair small nicks with neoprene glue before they spread.
• Don’t leave it in a hot car boot.

Safety: Your wetsuit changes your buoyancy, and buoyancy is a safety issue. Weight yourself so that you are positively buoyant at the surface and in the shallow part of your ascent, recheck your weights whenever you change suits, and never freedive without a trained buddy watching you.

Before you order your first suit

• Decide what you’ll mostly do: pool sessions, shallow reef or line training at depth.
• Choose thickness for your typical water, not the coldest day you can picture.
• If you’re new and rough on gear, a lined or fabric-covered suit forgives mistakes.
• Get measured properly, ideally with someone helping, before ordering online.
• Add a lubricant bottle, neoprene glue and a hanger to your freediving gear checklist.

The freediving.in community is coming soon. Stay tuned.