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!
FAQs
What mm is the warmest wetsuit?
Generally speaking, most wetsuits provide insulation for additional warmth to keep your core temperature at its best for excellent performance. The warmest wetsuits are usually 6/5mm, 7mm, or thicker, depending on the activity and water temperature.
Is a 3mm wetsuit ok for the UK?
A 3mm wetsuit is ideal for UK summer months (June–September) when water temperatures range between 14–18°C, offering warmth and flexibility for surfing and swimming. However, for spring, autumn, or winter, when temperatures drop below 14°C, a thicker wetsuit (4/3mm or 5/4mm) is necessary, especially for extended water sessions. For year-round comfort, match your wetsuit thickness to the season and activity.
Is a 5mm wetsuit too warm?
A 5mm neoprene thickness is ideal for water temperatures between 10°C and 15°C, offering warmth and a fair amount of flexibility for activities like surfing or diving. In warmer waters above 15°C, it may feel too warm, and a thinner wetsuit (3mm or 2mm) is a better choice.
What does 4/3 mean on a wetsuit?
In a wetsuit, 4/3 refers to the thickness of the neoprene material in millimetres:
- 4mm: Thickness in the core areas (e.g., chest and back) for maximum warmth.
- 3mm: Thickness in more flexible areas (e.g., arms and legs) for better mobility.
Can you swim in a 5mm wetsuit?
Yes, you can swim in a 5mm neoprene thickness, but it depends on the activity and conditions:
- Pros: A 5mm wetsuit provides excellent insulation, making it ideal for cold water swimming.
- Cons: The thicker neoprene may restrict mobility and create drag, which can affect performance during extended or competitive swimming due to fatigue.
For warmer water or competitive swimming, a thinner wetsuit (2mm–3mm) is often a better choice for improved flexibility and comfort.
Is a 3mm wetsuit ok for winter?
A 3mm wetsuit is generally not ideal for winter, especially in colder water temperatures. It’s more suitable for mild winter conditions or early spring where water temperatures are between 12°C and 15°C
What are the thinnest wetsuits?
The thinnest wetsuits typically range from 1mm to 2mm in thickness. These suits are specifically designed for warmer water temperatures, offering minimal insulation but maximum flexibility, allowing for a full range of movement in tropical or summer waters.
A 1mm wetsuit is ideal for tropical conditions with very warm water temperatures, providing light protection against the sun, wind, and minor abrasions. On the other hand, a 2mm wetsuit offers slightly more insulation, making it a great option for slightly cooler waters, like those found in late spring or early autumn, where you still need some warmth but don’t require heavy-duty protection.
