The choice between a wetsuit and a drysuit is one of the most consequential gear decisions a diver makes — it affects your comfort, the water you can dive in, your training requirements and how much you spend. The simple rule of thumb is: above 18 °C, a wetsuit usually does the job; below 12 °C, a drysuit is essentially mandatory; the 12–18 °C range is the messy middle where personal tolerance and trip length make the call.
Wetsuits work by trapping a thin layer of water between you and the neoprene, which your body heat warms. They're cheaper, simpler, easier to travel with and require no special training. The downside is heat loss — even thick wetsuits eventually cool you down on long or repeated dives.
Drysuits keep you completely dry by sealing at the neck and wrists, with insulating undergarments providing warmth. They unlock cold-water diving — Norway, Iceland, the Great Lakes, deep wrecks at any latitude — and dramatically extend bottom time in temperate water. The trade-off is cost (€1,500–€3,500 to buy), training (a Drysuit Diver specialty is required by most operators), and the steeper learning curve for buoyancy control.
This guide compares both options across thickness/warmth ratings, real-world dive scenarios, costs, maintenance and travel-friendliness so you can pick the right exposure suit for your diving profile.
| Wetsuit | Drysuit |
|---|---|
| 18–30 °C (with right thickness) | Below 18 °C (warmer with light undergarments) |
| €80 – €300 | €800 – €1,800 |
| €400 – €700 | €2,000 – €3,500 |
| None | Drysuit Diver specialty (1–2 days) |
| 1.5 – 4 kg | 5 – 8 kg |
| Standard BCD only | Manage two air spaces (BCD + suit) |
| 5 minutes | 10–15 minutes |
| 3–5 years | 8–15 years with care |
| Often replace | €50–€300 for seals/zips |
| Inevitable | Minimal with proper undergarments |
A **3 mm wetsuit** is suitable for tropical water (26–30 °C) — Caribbean, Red Sea summer, southeast Asia. A **5 mm full suit** with hood and gloves works in 20–25 °C (Mediterranean summer, Galápagos warm season). A **7 mm semi-dry** suit pushes the envelope down to 14–18 °C (UK summer, Galápagos cool season, deep Mediterranean winter).
Below 14 °C, even a 7 mm semi-dry will leave most divers cold after 30 minutes. This is where drysuits become essential. With a **medium-weight undergarment**, a drysuit handles 8–14 °C comfortably. With **heavy thinsulate undergarments**, drysuit divers regularly dive in 0–8 °C water (ice diving, Arctic, deep Great Lakes).
Wetsuits require **no special training** — you just wear them. Buoyancy works as taught in your Open Water course: BCD adds and dumps air to control depth.
Drysuits require a **PADI Drysuit Diver** (or equivalent) specialty course, typically 1–2 days with confined water and open water sessions. The key skill is managing **two air spaces** simultaneously — the suit and the BCD. Beginners often struggle with feet-first ascents (air migrating to the boots), inverted buoyancy losses, and squeeze on descent. Most divers need 10–20 dives to feel truly comfortable in a drysuit.
**Wetsuit path**: A 5 mm full suit at €350, replaced every 3 years (€700 total over 5 years), plus hood and gloves (~€80) = ~€780 for 5 years.
**Drysuit path**: A mid-range trilaminate suit at €1,800, valve and seal maintenance every 2 years (€150–€300), plus 2 sets of undergarments (€400) = ~€2,500–€2,800 for 5 years. However, a well-maintained drysuit can last 10+ years, dropping the long-term cost per dive significantly.
For a tropical-only diver, the wetsuit is far cheaper. For a mixed-water diver doing 3+ cold trips per year, the drysuit pays back in comfort and bottom-time hours.
Wetsuits are **easy to travel with**: roll them up, stuff them in a wet bag. Maintenance is rinse-and-dry. Wear and tear shows in stretched neoprene, broken zippers and mildew.
Drysuits are **bulky and heavy** (5–8 kg packed). Most divers use a dedicated wheeled bag or a roller dive case. Maintenance is more involved: latex/silicone neck and wrist seals must be replaced every 1–3 years (€80–€150 each), zippers need wax, and any leak demands a soapy-water test to find. Done right, a drysuit lasts 10–15 years.
Stick with **wetsuits** for tropical and warm-temperate diving — they're cheaper, lighter, simpler. Invest in a **drysuit** if you dive cold water more than a few times a year, plan ice or deep-wreck trips, or want maximum comfort on long dives in temperate seas. For mixed divers, owning both is the gold standard.
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