Ultimate Guide - Which Wetsuit Thickness Should I Choose?
Ultimate Guide - Which Wetsuit Thickness Should I Choose?
Picking the right wetsuit to ensure optimal comfort and fun is a key component of any water adventure, and the thickness of the wetsuit is one of the most important factors to consider. Whether you're catching waves, diving deep, or taking a chilly plunge, the right wetsuit thickness ensures you stay warm, comfortable, and safe in the water.
But… What thickness is best for you? Don’t stress — we’ve got you covered! In this ultimate guide, we’ll walk you through everything you need to know about wetsuit thickness and help you choose the perfect fit for your next aquatic adventure.
Decoding Wetsuit Thickness
Wetsuit thickness is measured in millimetres (mm) and typically refers to the thickness of the neoprene material used in the wetsuit's body. The thicker the wetsuit, the warmer it will keep you and the more time you can spend enjoying your favourite hobbies. The thicker the wetsuit the less flexibility, so there's always a balance between warmth and ease of movement. It’s important to consider your mm carefully and always be mindful of water and air temperatures.
Wetsuits are usually made from varying thicknesses of neoprene for different body parts. For example, the torso may be thicker for warmth, while the arms and legs may be thinner for flexibility and this is often displayed with a “/”. An example of that would be a 3/2mm – this means the body is 3mm but the arms are 2mm offering excellent flexibility for crucial areas and minimising fatigue for a more enjoyable session. Here are some common wetsuit thicknesses:
| 2mm | Best for warm, tropical water temperatures. |
| 3/2mm | Ideal for moderate temperatures, around 15°C to 20°C |
| 4/3mm | Perfect for cooler waters, typically between 10°C and 15°C |
| 5/4mm | Suitable for cold waters, 7°C to 10°C |
| 6/5mm | Designed for very cold waters, usually below 7°C |
Choosing the Right Wetsuit Thickness
Now that we have covered the basics of wetsuit thickness, it’s time to match the right suit to your water sport and the water temperature of your local break.
Here’s a breakdown of recommended wetsuit thicknesses for various conditions:
1. Warm Waters (Above 20°C)
If you’re planning to surf, swim or dive in warm waters, you won’t need a thick wetsuit but rather something with thinner neoprene. A 2mm wetsuit is perfect for these conditions as it provides a light thermal layer for your organs to ensure they are kept at the optimal temperature. It also provides enough protection from the elements without causing you to overheat.
You can also opt for a short-sleeve or short-john wetsuit for more freedom in the water depending on what suits your activity the best. We recommend always opting for a wetsuit even when the water is warm to protect you from the sun and chafe if you are planning on surfing, snorkelling or swimming.
| Recommended wetsuit thickness: 2mm |
| Perfect for: Surfing, swimming, and diving in tropical waters |
2. Mild Waters (15°C - 20°C)
For moderate temperatures, a 3/2mm wetsuit is the go-to option. It’s comfortable for most activities as it offers a good balance of warmth and flexibility. This thickness will keep you warm without restricting your movement, making it perfect for surfing or diving in temperate waters. We recommend a full wetsuit if there is a lot of wind chill as this can often make you colder faster even when it’s hot so it’s best to keep this in mind.
| Recommended wetsuit thickness: 3/2mm |
| Perfect for: Surfing, diving, and swimming in spring and autumn conditions |
3. Cold Waters (10°C - 15°C)
In cooler waters, a 4/3mm wetsuit is the perfect option. It provides extra insulation for your torso and legs without sacrificing too much flexibility in your arms – ensuring optimal performance. This thickness is often used by surfers, kayakers, and divers who brave colder temperatures during the winter months to ensure they get the most out of their sesh.
| Recommended wetsuit thickness: 4/3mm |
| Perfect for: Cold-water surfing, diving, and swimming in winter months |
4. Very Cold Waters (7°C - 10°C)
If you’re heading into freezing waters, you’ll need a thicker wetsuit. A 5/4mm wetsuit will offer the necessary insulation to keep you warm and comfortable. This thickness is typically used by surfers in coastal regions with chilly waters or those who enjoy winter surfing. We also recommend a neoprene hood, wetsuit boots and gloves for those extremely cold temperatures for extra warmth.
| Recommended wetsuit thickness: 5/4mm |
| Perfect for: Cold-water surfing and diving in frigid winter temperatures |
5. Extreme Cold Waters (Below 7°C)
For extreme cold-water conditions, a 6/5mm wetsuit is essential as well as wetsuit boots, hood and gloves. This thick wetsuit will ensure you are snug in very low temperatures, protecting all your vital organs and keeping your body safe from the cold. Often used by divers or surfers in the coldest climates, this wetsuit thickness will provide maximum insulation and warmth while still offering a nice amount of flexibility.
| Recommended wetsuit thickness: 6/5mm |
| Perfect for: Extreme cold-water diving, surfing, and swimming in polar waters |
Other Factors to Consider When Choosing Wetsuit Thickness
While the water temperature is without a doubt the primary factor in choosing a good wetsuit thickness, there are other elements you should consider:
Activity Level: If you’re highly active, you may generate more body heat, allowing you to choose a thinner wetsuit. Conversely, if you’re relatively stationary (such as when scuba diving), you might need a thicker wetsuit to retain heat.
To clarify this point if you are a swimmer in waters (15°C - 20°C) then opting for a 3/2mm is an ideal choice. However, if you are surfing or diving where your movements for the most part are slow or stationary a 4/3mm would be more beneficial. So make sure to always keep this in mind when you decide on your next wetsuit.
Duration of Exposure: Longer periods in the water will require a thicker wetsuit to ensure that you stay warm.
Personal Preferences: Some people naturally feel colder or warmer than others. If you’re someone who gets cold easily, you might want to opt for a thicker suit, even in milder waters.
Fit: A well-fitting wetsuit will help trap body heat but prevent water from getting in, so be sure to choose a wetsuit that fits snugly without restricting movement.
Chest Zip: Offers better warmth and a snug fit by reducing water entry. It’s more flexible and lightweight but can be trickier to put on and take off.
Back Zip: Easier to wear with a long zipper at the back, but it may allow more water to seep in, making it less efficient for colder conditions.
Shop Wetsuits at the Wetsuit Centre
Now that you understand wetsuit thickness, it's time to find the perfect wetsuit for your next adventure. Whether you're looking for a 3/2mm wetsuit for moderate conditions or a 6/5mm wetsuit for extreme cold, the Wetsuit Centre has a wide range of wetsuits to choose from.
Shop Now for a variety of wetsuits for all water activities, including surfing, diving, and swimming. Our selection includes top brands like Xcel, Patagonia, O'Neill, and more. You’ll find wetsuits made from eco-friendly materials, ensuring you stay warm while also supporting the planet. Don't forget to check out our epic Wetsuit sales for all year-round great deals.
Need help finding the perfect wetsuit? Visit the Wetsuit Centre for expert advice and a wide selection of wetsuits for every condition and budget. Happy surfing!
