Wetsuit guide

The right wetsuit for every water temperature and body type — so every dive stays comfortable.

Why It Matters

The Right Neoprene Thickness

A properly fitting wetsuit is crucial for comfort and safety underwater. If it is too thin, you will freeze and the dive becomes miserable. If it is too thick, you will overheat on the surface and the extra buoyancy makes descending more difficult.

Choosing the right thickness depends not only on water temperature but also on individual factors such as body type, personal cold sensitivity, and planned dive duration.

On a liveaboard you dive four or five times a day, so the suit that felt fine on a single holiday dive can leave you shivering by the third day. Water conducts heat about 25 times faster than air, which is why even 28°C tropical water slowly drains warmth over a 60-minute dive. Think in terms of the whole week rather than one dive, and factor in wind on the deck, air conditioning in the salon and early morning entries. A 3mm full suit plus a hooded vest is often the most flexible answer for warm destinations, while 5mm with hood, gloves and boots covers most temperate liveaboard itineraries.

Temperature Guide

Neoprene Thickness by Water Temperature

Water temperature is the starting point for every wetsuit decision, but read the ranges below as guidance rather than rules. The numbers assume a 50 to 60 minute dive, moderate activity and a suit that actually fits; repetitive liveaboard days, thermoclines and strong currents all push you one step warmer. Pick the band that matches the coldest water on your itinerary, not the average.

2–3mm

Tropical Waters

24°C+ (75°F+)

Ideal for warm dive destinations like the Caribbean, Maldives, or Red Sea in summer. Provides minimal thermal protection but shields against sunburn and minor abrasions.

5mm

Temperate Waters

20–24°C (68–75°F)

The most versatile choice for most dive destinations worldwide. Suitable for the Mediterranean, subtropical regions, and warmer seasons in temperate zones.

7mm

Cold Waters

10–20°C (50–68°F)

For colder waters like Northern Europe, Canada, or deeper dives. Often combined with a hood, gloves, and booties for complete thermal protection.

Drysuit

Ice Cold Waters

< 10°C (50°F)

For extreme cold like ice diving, Scandinavia, or Antarctica. Keeps the body completely dry and allows for variable insulation layers underneath.

Personal Fit

Individual Factors

The right wetsuit thickness is never just about water temperature. Your body composition, metabolism, air consumption and personal cold sensitivity decide how warm you stay on a liveaboard where four or five dives a day are normal. Repetitive diving cools you down cumulatively, so most divers need one step more neoprene than a single dive would suggest. Dive duration, depth, current and surface intervals in wind or air conditioning matter just as much. Use the factors below to fine-tune your wetsuit choice — and when in doubt, pack the warmer option plus a hooded vest.

Body Type & Weight

Slender individuals with less body fat lose heat faster and should choose a thicker suit. People with more body mass have natural insulation and can often dive comfortably in thinner suits.

Personal Cold Sensitivity

Some people naturally feel cold more easily than others. If you tend to get cold on land, you should always opt for the next thickness level when diving.

Dive Depth & Duration

The deeper you dive, the colder the water becomes. During longer dives, your body cools down more significantly. Plan for extra insulation on deep or extended dives.

Activity Level

Active diving with lots of movement generates more body heat. Photographers or observers who move less should choose thicker suits to compensate.

Body Type

Recommendations by Build

Body shape changes how a wetsuit performs, so the same 5 mm suit will not feel the same on every diver. Slim builds lose heat faster and depend on a snug, gap-free fit, while larger builds usually carry more natural insulation but need generous cuts and extra length to avoid flushing at the neck, wrists and ankles. Use the build recommendations below to match neoprene thickness, suit style and size to your body — a properly fitted wetsuit always beats a thicker one that lets water in.

Slim Build

Generally choose one thickness level higher

Tropical (24°C+)3mm
Temperate (18–24°C)5–7mm
Cold (10–18°C)7mm + Hood
Very Cold (<10°C)Drysuit

Larger Build

More natural insulation

Tropical (24°C+)2–3mm / Shorty
Temperate (18–24°C)3–5mm
Cold (10–18°C)5–7mm
Very Cold (<10°C)7mm / Drysuit
Pro Tips

Practical Tips

These practical wetsuit tips come from real liveaboard weeks, not from a shop catalogue. Layering a thin vest or hooded top under your suit adds warmth without buying a second wetsuit, and a snug fit matters far more than raw neoprene thickness. Rinse and dry your suit between dive days, hang it on a wide hanger instead of folding it, and pack a windproof layer for surface intervals. Small habits like these keep you warm from the first dive of the trip to the last.

Layering Technique

For borderline temperatures, wear a thin vest under your suit. A 5mm suit with a 2mm vest provides similar insulation to a 7mm suit but offers more versatility.

Fit is everything

A well-fitting 5mm suit insulates better than a poorly fitting 7mm suit. The suit should fit snugly without restricting movement or creating folds where water can flush through.

Head, Hands & Feet

In water temperatures below 20°C, you lose significant heat through your head. A neoprene hood, gloves, and booties can make the difference between a comfortable dive and shivering.

When in Doubt: Go Thicker

If you are unsure, choose the thicker suit. You can always let some water in to cool down, but you cannot make a too-thin suit warmer underwater.

Quick Reference

24°C+

→ 2–3mm

20–24°C

→ 5mm

10–20°C

→ 7mm

<10°C

→ Drysuit

These recommendations are for average divers. Adjust the thickness based on your personal cold sensitivity.

Plan your trip

Find your liveaboard

Choose a destination or search every available vessel to find the liveaboard that matches your wetsuit and water temperature.

Explore destinationsSearch liveaboards