Choosing the right underlayer for your wetsuit can significantly impact your comfort, warmth, and overall diving or watersports experience. Many factors influence this decision, including water temperature, the type of wetsuit, and the duration of your activity. This comprehensive guide explores the various options and helps you determine what to wear under your wetsuit.
What is the Purpose of Wearing Something Under a Wetsuit?
The primary purpose of wearing something under a wetsuit is to enhance insulation and thermal protection. Wetsuits work by trapping a thin layer of water between the suit and your skin. This water is warmed by your body heat. However, in colder water, this isn't enough. An underlayer helps to retain that heat more effectively, preventing excessive heat loss and keeping you comfortable for longer periods. Additionally, some underlayers offer enhanced comfort by providing a smoother surface against your skin, reducing chafing.
What are the Different Types of Underlayers for Wetsuits?
Several options exist for what to wear under a wetsuit, each offering unique benefits:
1. Rash Guards/Swim Shirts:
These are lightweight, often made from lycra or polyester, and offer minimal insulation. They primarily serve as a base layer for sun protection and to prevent chafing. They are best suited for warmer water temperatures where additional insulation isn't necessary.
2. Thermal Underwear (Long Underwear):
Thermal underwear, often made from merino wool, polypropylene, or synthetic blends, provides superior insulation compared to rash guards. They trap air, adding an extra layer of warmth. The choice of material will impact the level of insulation and how quickly it dries. Merino wool is naturally odor-resistant and helps regulate body temperature.
3. Neoprene Undersuits:
These are made from neoprene, the same material as wetsuits, but usually thinner. They offer excellent insulation and often have a smoother inner lining for comfort. Neoprene undersuits are ideal for colder water conditions where maximum warmth is required.
4. Wetsuit Shorts and Tops (Underneath a thicker wetsuit):
Some divers and surfers opt for a thinner wetsuit underneath a thicker one, especially in extremely cold water. This layering strategy provides maximum thermal protection.
What to Wear Under a Wetsuit Based on Water Temperature?
The ideal underlayer heavily depends on the water temperature:
- Warm Water (Above 70°F/21°C): A rash guard or swim shirt is often sufficient.
- Moderate Water (60-70°F/15-21°C): A lightweight thermal top and bottoms or a thin neoprene undersuit might be necessary.
- Cold Water (Below 60°F/15°C): A heavier thermal underwear set or a thicker neoprene undersuit is recommended. You may even consider layering thermal underwear under a neoprene undersuit for extreme cold.
What About Materials? What’s Best?
The material of your underlayer significantly affects its performance:
- Merino Wool: Excellent insulation, moisture-wicking, and odor-resistant properties.
- Polypropylene: Good insulation, quick-drying, and moisture-wicking. Less comfortable against the skin than merino.
- Synthetic Blends: Offer a balance of insulation, moisture-wicking, and cost-effectiveness. Look for blends with added features like anti-microbial properties.
- Neoprene: Excellent insulation and durability. Less breathable than other options.
Should I wear a swimsuit under my wetsuit?
Wearing a swimsuit under your wetsuit is generally not recommended. It adds unnecessary layers, can restrict movement, and may trap moisture, reducing the effectiveness of your wetsuit. Most wetsuits have a smooth inner lining that eliminates the need for a swimsuit.
What should I consider when buying an underlayer for my wetsuit?
Consider these factors when selecting an underlayer:
- Water Temperature: The most crucial factor determining the necessary insulation level.
- Activity Level: More strenuous activities may require lighter, more breathable materials.
- Personal Preference: Comfort and fit are essential. Try different materials and styles to find what works best for you.
- Suit Type: The thickness and type of your wetsuit will influence the required level of insulation from the underlayer.
By carefully considering these factors, you can select the ideal underlayer to maximize comfort, warmth, and enjoyment during your water activities. Remember that layering is key to adapting to varying water conditions.
