Wetsuit Thickness Guide & Calculator
Not sure whether you need a 3mm, 5mm or 7mm wetsuit? Use this simple calculator to choose the right exposure protection for your dive conditions, then check our quick local guidance for Protea Banks, Aliwal Shoal and the Sardine Run.
Wetsuit Thickness Calculator
Protea Banks
Many divers are comfortable in a 5mm wetsuit in warmer months, while others prefer a 7mm if they feel the cold or are doing repeated dives. A hooded vest can make a big difference.
Aliwal Shoal
Conditions are often similar to Protea Banks. Many visiting divers choose a 5mm full suit, while colder divers may prefer extra layering or a 7mm during cooler periods.
Sardine Run
Sardine Run conditions can feel colder, especially with wind, long surface time and multiple launches. Many divers are more comfortable in a 7mm wetsuit or similar warm exposure protection.
How to Choose the Right Wetsuit
Wetsuit thickness is not only about water temperature. Your comfort also depends on wind chill on the boat, the number of dives you are doing, how long you stay in the water, and whether you naturally feel cold quickly.
As a simple rule, warmer-water divers doing short dives can often use thinner suits, while divers doing deeper, longer or repeated dives usually benefit from more insulation. If you are unsure, it is normally better to be slightly too warm than underdressed and cold for the whole day.
Quick Wetsuit Thickness Guide
| Water Temperature | Typical Recommendation |
|---|---|
| 27°C+ | Shorty or 3mm |
| 24–26°C | 3mm full suit |
| 21–23°C | 5mm full suit |
| 18–20°C | 5mm to 7mm |
| 17°C and below | 7mm, semi-dry or drysuit depending on exposure |
Frequently Asked Questions
Is a 5mm wetsuit enough for Protea Banks?
For many divers, yes. But if you get cold easily, are doing repeated dives, or are diving in cooler conditions, a 7mm or added layer may be more comfortable.
Should I wear boots, gloves or a hood?
Boots are usually a good idea. A hood or hooded vest can make a major difference if you tend to lose heat quickly. Gloves depend on your comfort and local diving practices.
What if I am between two thicknesses?
If you are uncertain, choose the warmer option, especially for boat diving, early starts, windy days and repeat dives.
Planning a Dive Trip?
If you are diving Protea Banks, Aliwal Shoal or joining the Sardine Run, choosing the right wetsuit is one of the easiest ways to stay comfortable and enjoy the day.
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Wetsuit Thickness for South Africa Diving
Diving conditions around South Africa can vary depending on the season, currents and weather. Along the KwaZulu-Natal coast, including popular sites like Protea Banks and Aliwal Shoal, divers normally experience moderate water temperatures that allow comfortable diving with mid-range wetsuits.
Many visiting divers choose a 5mm wetsuit as a versatile option, while those who feel the cold easily or plan multiple dives in a day may prefer a thicker suit or additional layers. Boat travel, wind exposure and surface intervals can also influence how warm you feel during a dive day.
The wetsuit thickness calculator above helps divers quickly estimate the most suitable exposure protection based on water temperature, dive duration and personal cold tolerance. This makes planning easier whether you are preparing for shark dives at Protea Banks or seasonal events like the Sardine Run.
