What Do You Wear Under a Wetsuit? A 2026 Guide to Gear and Comfort

Understanding what to wear under a wetsuit is essential for ensuring comfort, warmth, and freedom of movement during your water activities. Whether you're surfing, open-water swimming, or diving, the right undergarment can enhance your experience and performance. In this guide, we answer the common question: what do you wear under a wetsuit for different water temperatures and activities, so you can stay comfortable and perform at your best.

What Do You Wear Under a Wetsuit?

When it comes to wearing a wetsuit, the choice of undergarment plays a critical role in comfort, warmth, and overall performance. The right choice depends on water temperature, activity type, and personal comfort preferences. To better understand what do you wear under a wetsuit in different conditions, here’s a quick comparison:

1. Going Bare 

Some athletes and water enthusiasts opt to go bare beneath their wetsuits or trsuits, especially during short sessions or when the water temperature is warm enough to forgo additional layers. Going commando allows for the closest contact with the wetsuit, maximizing flexibility and performance. However, this option is not always ideal for long sessions or colder waters, where warmth and protection are needed.

Pros:

• Freedom of movement with no added bulk.
• Direct contact with the wetsuit, which may enhance insulation and warmth.

Cons:

• Risk of chafing, especially during prolonged activities.
  Hygiene concerns, particularly when using rental wetsuits.

2. Swimwear

Swim trunks, jammers, or briefs for men, or a one-piece swimsuit or bikini for women, are among the most common undergarments for a wetsuit. Swimwear is lightweight and specifically designed for water sports, making it ideal for most activities, particularly during moderate to warm water conditions.

It’s important to choose swimwear that fits snugly to avoid bunching or discomfort, especially during movement in the water.

Pros:

• Lightweight and designed for water activities.
• Quick-drying and breathable materials.
• Available in a variety of styles and sizes, making them easy to personalize.

Cons:

• Can bunch up under the wetsuit if not fitted properly.
• May not provide additional warmth or insulation in cooler waters.

3. Rash Guards & UV Protection Tops

Rash guards or UV protective jerseys are another popular option. These garments are designed to protect your skin from the wetsuit’s interior and to shield you from the sun during long sessions. They’re lightweight, quick-drying, and ideal for warm-to-temperate water conditions. Though great for preventing chafing, rash guards may not be as effective in colder waters, where additional insulation is necessary.

Pros:

• Prevents friction between your skin and the wetsuit, reducing irritation.
• Offers UV protection, making them ideal for extended time in the water.
• Quick-drying, breathable, and comfortable for extended wear.

Cons:

• May not be as warm as thicker base layers in cold water.
• Can feel too thin if more insulation is required for extreme temperatures.

4. Thermal Layers

If you’re heading into colder waters, a thermal base layer is essential for providing additional warmth. These base layers are designed to trap heat and keep your body warm even when submerged in freezing waters. Materials such as merino wool or quick-drying fleece are commonly used for thermal base layers, providing comfort and moisture-wicking. You can use padded cycling tights underneath for maximum warmth.

Pros:

• Provides warmth and insulation, keeping you comfortable in freezing waters.
• Materials like merino wool and fleece wick moisture and dry quickly.

Cons:

• Can add bulk, which may reduce flexibility and mobility.
• Not ideal for warmer water conditions due to heat retention.

5. Neoprene Base Layers

Neoprene base layers, made from 1–2mm thick neoprene, are specifically designed to add warmth without sacrificing flexibility. They offer a balance between insulation and performance, making them ideal for divers, surfers, and triathletes who require a snug fit and thermal protection. While neoprene is great for cold water, it may not be as breathable as other materials, making it less suitable for warmer climates.

Pros:

• Provides additional warmth while maintaining flexibility and mobility.
• Lightweight and designed for performance, making it ideal for active water sports.
• Can be used for both wetsuit and drysuit wearers.

Cons:

• Less breathable than other options, making it less suitable for warmer conditions.
• Can become uncomfortable in hot weather due to limited air circulation.

6. Triathlon-Specific Suits

For triathletes, triathlon suits or trisuits are an excellent choice under a wetsuit. These suits are designed to dry quickly and minimize drag in the water, making them perfect for competitive swimming events. They’re also moisture-wicking, helping to keep you dry during transitions between events. While tri-suits are lightweight and great for performance, they may not provide as much warmth in colder conditions as thermal base layers or neoprene.

Pros:

• Designed for quick transitions in multi-sport events.
• Moisture-wicking and fast-drying, keeping you comfortable during multiple activities.
• Reduces drag, improving swimming performance.

Cons:

• It may not provide sufficient warmth in colder waters compared to thermal layers.
• Less insulation, which can be problematic in frigid temperatures.

Choosing the right undergarment for your wetsuit can significantly impact your performance and comfort. Whether you're aiming for maximum flexibility with swimwear or need extra warmth with thermal layers or neoprene, understanding the best options for your specific water activity and conditions is key. From going bare in warm waters to layering up for cold dives, each choice has its benefits and considerations.

What Not to Wear Under a Wetsuit

While there are several great options for what to wear under a wetsuit, there are a few things you should avoid to ensure comfort, mobility, and overall performance:

• Cotton Clothing: Cotton absorbs water quickly, becoming heavy, soggy, and uncomfortable. It also doesn’t dry fast, which can leave you feeling cold during and after your water activity.
• Bulky Underwear or Layers: Thick or loose-fitting underwear can bunch up under the wetsuit, causing irritation and restricting movement. Tight-fitting, streamlined layers are always best to avoid discomfort.
• Jeans or Non-Water Clothing: Jeans, socks, and other non-water-resistant clothing can create drag and hinder your movement in the water. These materials are also heavy and uncomfortable when wet.

Stick to materials like Lycra, spandex, and neoprene for optimal comfort and performance. These materials provide flexibility, quick drying, and warmth, ensuring a smoother wetsuit experience.

Why Does What You Wear Under a Wetsuit Matter?

Understanding what do you wear under a wetsuit isn’t just about comfort; it directly impacts your warmth, mobility, and overall performance in the water. The right choice can make a significant difference in how you feel, how you perform, and how you stay safe. From preventing discomfort to ensuring hygiene, here’s why it truly matters:

1. Comfort

A proper underlayer prevents chafing and discomfort, which can quickly ruin your experience, especially during long sessions. Whether it’s the inner lining of the wetsuit rubbing against your skin or friction from water movement, the right choice makes all the difference.

2. Temperature Regulation

Wetsuits are designed to provide thermal protection, but in colder waters, layering beneath the wetsuit helps retain heat. Your choice of clothing can enhance insulation and keep you warm longer, while in warmer waters, lighter layers will help you avoid overheating.

3. Hygiene

Many people use rental wetsuits, and proper undergarments help maintain hygiene and prevent skin irritation. The right base layer minimizes exposure to the wetsuit’s interior and its shared use, especially in rental and public settings.

In short, what you wear under your wetsuit plays a crucial role in ensuring a comfortable, efficient, and hygienic experience. Make sure to choose the right gear that aligns with your activity and water conditions. This small decision can make a big impact on your time in the water!

How to Choose What to Wear Under a Wetsuit

Choosing the right undergarment for your wetsuit may seem like a simple decision, but it can significantly affect your performance, comfort, and overall experience in the water. Here’s a step-by-step guide to help you make the right choice:

1. Consider the Water Temperature

The water temperature is one of the most important factors in determining what to wear under your wetsuit. For warm waters, you might be comfortable with just swimwear, but in colder conditions, you’ll need additional layers like thermal tops or neoprene base layers for warmth.

• Cold Water (below 60°F/15°C): Opt for thermal base layers or a wetsuit liner to trap warmth.
• Moderate Water (60°F–70°F/15°C–21°C): A rash guard, swimwear, or a thin neoprene layer should be enough.
• Warm Water (above 70°F/21°C): Swim trunks, bikinis, or going bare may work best.

2. Think About Your Activity

Different water activities may require different levels of insulation and flexibility. Surfers may want something that enhances flexibility, while divers or open-water swimmers may need extra warmth.

• Surfers: A rash guard or swimwear is ideal for preventing chafing and maintaining flexibility.
• Divers: Neoprene base layers or thermal suits offer extra insulation to prevent hypothermia.
• Triathletes: A tri-suit or trisuit can help minimize drag and dry quickly during transitions.

3. Ensure Comfort and Fit

Regardless of the type of undergarment you choose, comfort and fit are paramount. Too tight or too loose can lead to discomfort, restrict movement, and even cause skin irritation. Look for materials that fit snugly without cutting off circulation, and always ensure your layers don’t add bulk under the wetsuit.

• Snug Fit: Choose clothing made from Lycra, spandex, or neoprene for a flexible, tight fit.
• No Bulky Layers: Avoid thick fabrics that can bunch up and make it harder to move.

4. Think About Hygiene

If you're using a rental wetsuit, hygiene becomes even more important. A thin base layer made from moisture-wicking materials will prevent direct skin-to-wetsuit contact, keeping you dry and comfortable. It also helps reduce the risk of skin irritation or infection.

• Avoid Cotton: Cotton absorbs moisture and takes too long to dry, leading to discomfort.
• Opt for Quick-Drying Materials: Choose materials like spandex, Lycra, or thin neoprene that dry quickly and wick sweat.

5. Test at Home

Before you head into the water, it’s a good idea to try on your wetsuit with the chosen undergarment at home. This allows you to test the fit, comfort, and mobility to ensure everything works well together.

By considering these factors, water temperature, activity type, comfort, and hygiene, you’ll be able to select the best undergarment for your wetsuit, making your time in the water more enjoyable and effective.

Pro Tip

Still unsure what do you wear under a wetsuit for your conditions? Match your base layer to water temperature first, then consider comfort and flexibility second.

Expert Tips for Comfort and Fit

Even the best wetsuit and base layer combination can feel uncomfortable if the fit is not right. Small adjustments can make a big difference in performance and overall enjoyment. Follow these practical tips to stay comfortable before, during, and after your session.

• Fit Is Key: Choose a snug, second-skin fit to prevent bunching and irritation, but avoid anything so tight that it restricts movement or circulation.
• Prevent Chafing: Apply anti-chafing balm on areas like the neck, underarms, and inner thighs for long sessions.
• Test at Home: Wear your wetsuit with your chosen underlayer beforehand to check mobility and comfort.
• Use Quick-Dry Gear: A quick-dry towel or changing poncho helps you warm up faster and stay comfortable post-session.

Comfort is not just about the wetsuit itself, but how every layer works together. When your fit is dialed in, you conserve energy and move more naturally in the water. A little preparation goes a long way toward a smoother, more enjoyable experience.

Best Places to Buy Underlayers for Wetsuits

Once you decide what do you wear under a wetsuit, the next step is choosing a trusted brand that offers performance-focused base layers. Choosing quality base layers and undergarments for your wetsuit can make a huge difference in comfort and performance. Below are three reputable brands and retailers where you can find excellent underlayers to wear under a wetsuit:

1. Sport Spot LLC 

Sport Spot LLC offers high-performance activewear that can double as base layers under a wetsuit. While primarily known for compression and training suits, their moisture-wicking fabrics, four-way stretch, and breathable design make them comfortable beneath a wetsuit and versatile for water sports too. Because Sport Spot focuses on fit, flexibility, and sweat management, their underlayers can perform better than generic athletic wear, especially for activities where mobility and quick drying are important.

2. Orca & Zone3 

Brands like Orca and Zone3 are frequently recommended for base layers designed specifically for water activities. Orca’s wetsuit base layers are flexible, easy to remove, and compatible with open-water swimming and surfing, while Zone3 offers neoprene warmth vests with excellent thermal properties. These layers provide a performance-oriented fit and insulation tailored to wetsuit use.

3. Scuba & Neoprene Base Layer Retailers

Specialized scuba retailers carry neoprene base layers and rash guards from established water-sports brands like NeoSport, Cressi, and O’Neill. These base layers are designed for water comfort, sun protection, and temperature regulation and are ideal for all types of water sports, including diving, snorkeling, and swimming.

When choosing where to shop, consider your primary activity and water temperature, whether you need quick-dry comfort, extra insulation, or a performance fit that won’t restrict movement. Sport Spot LLC stands out for its versatile fit and comfort, making it a strong option even compared to traditional wetsuit base layer brands, especially if you want a multi-purpose undergarment suitable for both land and water use.

Conclusion

Choosing what to wear under a wetsuit comes down to water temperature, activity level, and If you’re still wondering what do you wear under a wetsuit, the answer depends on water temperature, activity level, and personal comfort preferences. From swimwear and rash guards to thermal and neoprene base layers, each option serves a specific purpose in improving warmth, flexibility, and hygiene. By selecting the right underlayer and ensuring a proper fit, you can enhance performance, prevent discomfort, and make every surf, swim, or dive session more enjoyable.

FAQs

Below are answers to the most common questions people ask about what do you wear under a wetsuit and how to choose the right layer.

Are you supposed to wear something under a wetsuit?

It is not mandatory, but most people choose to wear something underneath for comfort and hygiene. A thin base layer, swimwear, or rash guard helps prevent chafing and improves overall comfort during longer sessions.

Can you wear a bra under a wetsuit?

Yes, you can wear a sports bra or swim bra under a wetsuit. It should be snug, seamless, and made from quick-drying material to avoid discomfort or bunching.

Should you wear thermals under a wetsuit?

Thermals are recommended in cold water conditions to add insulation and retain body heat. Choose low-profile thermal layers designed for water sports to avoid reducing flexibility.

Can you wear a wetsuit with nothing underneath?

Yes, many people go without anything underneath, especially in warm water. However, this may increase the risk of chafing and make hygiene less effective when using rental wetsuits.

What Do You Wear Under a Wetsuit?

If you’re wondering what do you wear under a wetsuit, the short answer is: swimwear in warm water, rash guards for comfort, and thermal or neoprene base layers in cold water. Your choice depends on temperature, activity, and session length.

What is the best layer under a wetsuit?

The best layer depends on water temperature and activity. For warm water, swimwear or a rash guard works well, while cold water requires thermal or thin neoprene base layers for added warmth.