A wetsuit is the single piece of gear most divers and watersports enthusiasts get wrong on first purchase. Wrong thickness or wrong fit means a miserable trip. After buying eight wetsuits over a 12-year diving career — and learning the hard way — here's how to pick, fit and care for one properly.
How a Wetsuit Works
Neoprene contains millions of nitrogen-filled bubbles. Water enters between your skin and the suit, gets trapped, warms to body temp, and stays there. Thicker neoprene = more insulation. Better fit = less water flushing through (which carries away heat).
The Thickness Chart
| Water temp | Wetsuit thickness |
|---|---|
| 27°C+ (warm tropical) | 2mm shorty or rashguard |
| 23-27°C (warm) | 3mm full |
| 18-23°C (mild) | 5mm full |
| 13-18°C (cool) | 7mm semi-dry + hood + gloves |
| Below 13°C (cold) | Drysuit |
These are general — personal cold tolerance varies wildly. Get one thickness category warmer if you're cold-blooded; one lighter if you run hot.
Wetsuit Types
By Coverage
- Rashguard / skin: 0.5-1mm lycra. UV protection only. Tropical lagoons.
- Springsuit / shorty: 2mm full body, short legs and arms. Tropical light.
- Full wetsuit: Long legs and sleeves. Bulk of the market.
- Two-piece (Farmer John + jacket): Doubles up neoprene over torso. Cold water.
- Semi-dry: Sealed wrists, neck and ankles to minimise flush. 7-9mm.
- Drysuit: Watertight seal, separate undergarment for warmth. 10°C and below.
By Activity
- Scuba: Heavier neoprene, knee pads, knife pocket, no harness pull.
- Surfing: Flexible neoprene, taped seams, rinse-spray friendly.
- Triathlon: Buoyant, ultra-thin neoprene, faster swim.
- Freediving: Open-cell neoprene, two-piece, very compressed at depth.
- Spearfishing: Open-cell with high-waist + jacket, camo patterns.
Fit — The Most Important Variable
- Tight without restriction. Should feel like a second skin.
- No gaping at lower back. Common fit fail.
- Shoulders sit naturally. No bunching or stretch lines.
- Wrists and ankles snug. Major flush points.
- Neck closes without choking. Should be firm but not strangling.
- Crotch high. If it sags, water collects there.
- Leg seams sit flush against thighs. No bunching at knees.
Try on with damp skin if possible — neoprene grips wet skin differently than dry.
Materials and Construction
Neoprene
- Standard rubber neoprene: Common, durable, cost-effective.
- Limestone neoprene: Yamamoto, more expensive, lighter and warmer per mm.
- Eco-neoprene: Yulex, Geoprene — sustainable alternatives, slightly less stretchy.
Seams
- Flatlock: Cheap, thin, fast-drying. Lets some water through. Tropical.
- GBS (glued and blind-stitched): Standard mid-range. Watertight.
- Sealed/taped: Premium. Internal tape over GBS for cold water.
- Liquid-taped: Outer rubber bead over seams. Highest quality.
Zippers
- Back-zip: Easy entry, slightly more flush.
- Chest-zip: Less flush, harder entry.
- Zipless / pullover: Best seal, hardest to put on.
Top Wetsuits by Category
Best Tropical Diving (3mm)
- Bare Reactive 3mm — USD 280, full thermal lining, comfortable.
- Mares Pioneer 3mm — USD 200, quality at price.
- ScubaPro Definition 3mm — USD 320, premium fit.
Best Cold Water Diving (7mm)
- Bare Velocity Ultra 7mm — USD 480, semi-dry seals.
- Mares Flexa 8/6/5 — USD 400, ergonomic fit.
- Aqua Lung Solafx 8/7 — USD 550, premium semi-dry.
Best Surfing
- Patagonia Yulex Wetsuit (3/2 or 4/3) — USD 380-500, eco-neoprene, premium.
- Rip Curl Flashbomb — USD 380, fast-drying smart fabric.
- Xcel Drylock — USD 400, fully sealed seams.
Best Freediving
- Beuchat Espadon Open-cell 5mm — USD 350, very compressed, supreme thermal-to-bulk.
- Mares Squadra 7mm — USD 450, two-piece.
Best Travel-Friendly
- Sharkskin Chillproof — not neoprene; lightweight thermal layer for warm water + AC.
- O'Neill Reactor 3/2 — USD 180, packable, durable.
Care and Maintenance
- Rinse fresh water after every saltwater session.
- Hang dry on wide hanger (not skinny wire — leaves marks).
- Don't fold for storage — creases break neoprene.
- Don't expose to sun for prolonged periods.
- Use wetsuit shampoo (B4 Adventures, Sink the Stink) once every 5-10 wears.
- Lubricate zip with bee's wax or zip-lube to prolong life.
- Patch small tears with neoprene cement.
Common Buying Mistakes
- Buying off-the-shelf without trying on. Online sizing fails.
- Going too thick "to be safe." Restricts movement, overheats in warm dives.
- Ignoring seam type for cold water.
- Cheap neoprene that compresses too much at depth (loses insulation).
- Rashguard alone in 24°C water on multi-dive day.
Wetsuit Lifespan
- Casual use: 8-10 years.
- Daily use: 3-5 years.
- Professional dive guide use: 1-2 years.
- Signs to replace: split seams, neoprene compression, persistent leaks at zipper, faded pliability.
Cost Range
| Use case | Budget | Premium |
|---|---|---|
| Tropical (3mm) | USD 120 | USD 380 |
| Mild (5mm) | USD 200 | USD 480 |
| Cold (7mm semi-dry) | USD 350 | USD 700 |
| Drysuit | USD 700 | USD 2,500+ |
Drysuit Considerations
- Required for <13°C diving for most people.
- Drysuit certification (1-2 days) needed.
- Adds buoyancy considerations.
- Membrane (lighter, packable) vs neoprene (warmer when leaking, heavier).
- Premium options: DUI, Santi, Bare Trilam, Whites.
Hood, Gloves and Boots
- Hood: 3mm for cool water, 5mm for cold. Adds substantial warmth.
- Gloves: 3mm (mild), 5mm (cold), dry gloves with drysuits in arctic.
- Boots: 3-5mm, with reinforced sole for shore entries.
Travel Tips
- Roll, don't fold, in the suitcase.
- Pack inside a dry bag or wetsuit-specific carrier.
- Allow 30-45 minutes to put on at the dive site.
- Talc or wetsuit lubricant helps with putting on dry suit.
Pair Up With Your Diving
- PADI — drysuit specialty courses.
- GetYourGuide — diving experiences with full kit.
- Viator — multi-day diving with rental gear.
Frequently Asked Questions
What thickness for the Maldives?
3mm full wetsuit — water is 27-29°C but multiple dives a day chill you. 2mm shorty for occasional warmer trips.
Can I dive in cold water with a 5mm?
Down to about 16°C with hood and gloves. Below 16°C, move to 7mm semi-dry. Below 13°C, drysuit.
How tight should a wetsuit be?
Snug everywhere, no bunching, no gaps at lower back, full range of motion in the shoulders.
How do I prevent wetsuit smell?
Rinse after every use, hang dry, occasional wash with wetsuit shampoo (B4 Adventures, Sink the Stink). Saltwater alone doesn't kill bacteria.
Do I need to buy or can I rent?
Rent for occasional dives. Buy if you dive 10+ times per year in the same temperature range. Custom-fit becomes worth it for the comfort.