What to Wear Under a Wetsuit: A Complete Guide

When it comes to water sports, diving, or surfing, a wetsuit is a fundamental piece of gear. But for those new to the aquatic world, a common question arises: “What exactly should I wear under my wetsuit?” You’re not alone! Whether you’re gearing up for a chilly dive, a surf session, or a sailing adventure, what you wear underneath your wetsuit can significantly affect your comfort and performance. This guide will cover everything you need to know about what to wear beneath a wetsuit, ensuring you stay warm, comfortable, and free to move.

Why Does What You Wear Under a Wetsuit Matter?

A wetsuit is designed to keep you warm by trapping a thin layer of water between the suit and your skin. Your body warms this water, which acts as insulation. However, the type of clothing you wear underneath your wetsuit can impact various factors:
1. Thermal Protection: In colder waters, the right base layer can enhance thermal insulation.
2. Comfort and Mobility: The wrong attire can restrict movement or cause discomfort.
3. Hygiene: Wearing proper garments can help maintain cleanliness, especially when sharing wetsuits.
4. Fit: Choosing the right undergarment can affect how well the wetsuit fits overall.
With these factors in mind, let’s explore what options are available for layering beneath your wetsuit.

1. The Basics: What You Shouldn’t Wear

Before diving into what you should wear, let’s discuss what you shouldn’t. Avoid cotton garments, such as T-shirts or regular shorts. Cotton absorbs water, sapping your body heat and making you cold instead of warm. Here are a few more things to remember:
No Cotton: Always steer clear of cotton fabrics.
No Loose or Bulky Clothing: These can create undesired drag in the water and impede movement.
Avoid Heavy Fabrics: The goal is to stay light and mobile.

2. Popular Options for Wearing Under Wetsuits

a. Wetsuit Bottoms

One of the most popular choices is to wear wetsuit bottoms, such as neoprene shorts or leggings. These are specifically designed for use under a wetsuit and provide additional thermal protection without being too bulky.
Pros:
Provides extra warmth.
Minimizes chafing and discomfort.
Allows full range of motion.
Cons:
Can be pricier than traditional baselayers.

b. Rash Guards

Rash guards are lightweight, often made from polyester or nylon, and primarily serve to protect your skin from rashes caused by abrasion against the wetsuit. They also provide UV protection.
Pros:
Great for warm water settings.
Helps with sun protection.
Reduces chafing.
Cons:
Limited thermal insulation compared to neoprene.

c. Thermals (Neoprene Tops and Bottoms)

For colder waters, layering up with thermal tops and bottoms made from neoprene is advisable. These pieces do an excellent job of keeping you warm without adding much bulk.
Pros:
Excellent thermal insulation.
Designed to fit snugly, avoiding excess water.
Cons:
This can be warmer in hot climates.

d. Specialized Underwear

There are several brands producing specialty underwear that is designed to be worn under wetsuits. These typically use moisture-wicking fabrics and flatlock seams to minimize chafing.
Pros:
Specifically made for use under wetsuits.
Often made of moisture-wicking fabrics to keep you dry.
Cons:
More expensive compared to regular athletic wear.

3. Layering for Different Water Conditions

a. Warm Water Conditions

In warm water, wearing a rash guard or simply your swimwear under the wetsuit is generally acceptable. You want to wear something that reduces chafing but does not add unnecessary insulation.
Recommendation:
Lightweight and quick-drying swimwear.
A rash guard for a little added protection from the sun and the wetsuit.

b. Temperate Water Conditions

For water that’s a bit cooler, consider wearing thin neoprene shorts and a short or long-sleeve rash guard underneath your wetsuit.
Recommendation:
Neoprene shorts or leggings.
A lightweight thermal or short-sleeve rash guard.

c. Cold Water Conditions

If you’re diving into significantly colder waters, wearing full neoprene layers for both the top and bottom is advisable. You’ll want to ensure there’s minimal water entering your wetsuit to maintain warmth.
Recommendation:
Full neoprene top and bottom.
A thermal rash guard or base layer to boost insulation.

4. Additional Tips for Comfort

1. Flush-Free Fit: Make sure your wetsuit fits snugly to avoid water flushing in and out. This is where moisture-wicking fabrics can help to keep you dry underneath.
2. Avoid Tags and Seams: Look for clothing designed specifically for use under wetsuits. These often have flat seams that avoid irritation on long sessions.
3. Test Before You Go: If possible, wear the full setup before heading out for a long session. This allows you to check for any discomfort, chafing, or areas where the wetsuit may fit poorly.
4. Layering for Added Warmth: In extremely cold conditions, consider using a thin thermal layer under your standard wetsuit, along with a thicker wetsuit. Layering helps trap warm water and keeps you comfortable.

5. Maintenance and Care of Your Under Layers

Keeping your undergarments clean and well-maintained is crucial for hygiene and longevity. Here are some quick care tips:
Rinse After Each Use: Immediately rinse your garments to remove saltwater and chlorine.
Air Dry: Always air dry your wet gear, as machine drying can result in shrinkage and damage.
Store Properly: Store your wetsuit and underlayers in a cool, dark place to prevent material degradation.

6. FAQs About Wetsuit Undergarments

Q: Can I wear a swimsuit under my wetsuit?

Yes, you can wear a swimsuit—just ensure it’s not made of cotton.

Q: Do I need to buy special thermal undies?

While not necessary, specialized thermal garments can offer better warmth and comfort.

Q: Will wearing more layers make me too hot?

It can, which is why it’s essential to gauge the water temperature. Choose moisture-wicking materials to stay cool and dry.

Conclusion

Choosing the right attire to wear under your wetsuit can significantly impact your experience in the water—comfort, warmth, and performance matter! From rash guards to specialized thermal layers, there’s no one-size-fits-all solution; instead, assess your water conditions and personal comfort to make the best choice. Remember, the goal is to maintain body heat and comfort while preventing chafing and improving your overall aquatic experience. With the right layers, you can focus on enjoying the incredible underwater world without the distractions of discomfort. Happy diving or surfing!