Types of Wetsuit Seams: How They Affect Warmth and Durability
Lauren October 28th, 2024 Posted In: Articles
Flatlock, GBS, sealed and taped, oh my! The world of wetsuit seams can seem a little overwhelming or maybe intimidating. You deserve to enjoy your time in or on the water as much as possible, so why not make sure you’re wearing the right wetsuit with the right seams?
When choosing the perfect wetsuit, seams are definitely a detail worth paying attention to. Wetsuit seams play a major role in how well a wetsuit insulates and withstands wear, particularly in extreme water conditions. Different seam types provide varying levels of warmth, flexibility, and durability.
Generally, the type of seam impacts how much water can seep through the suit, which directly affects how warm you stay and how long the wetsuit lasts in the long term. Below, we take a comprehensive look at the types of wetsuit seams, when and where they’re best suited, and what each type means for warmth and durability!
What are the Different Types of Wetsuit Seams?
Wetsuit seams come in a variety of stitching methods, each designed for different levels of water temperature, water activity, and longevity. Here’s a look at the most common seam types and how they’re constructed:
1. Overlock Stitching
Overlock stitching is the most basic and affordable seam type. It involves sewing the edges of the wetsuit material (neoprene) together, leaving a slightly raised seam on the inside. This method isn’t watertight, so it’s best for use in warm water where some water penetration won’t cause discomfort. Overlock seams are generally found in budget wetsuits or those made for mild climates.
- Water Temperature Suitability: Overlock seams are suited for water temperatures above 65°F (18°C) where warmth is not as crucial.
- Durability Impact: Overlock stitching can handle light wear and tear, making it suitable for occasional or beginner use, but it’s less durable than other seam types.
2. Flatlock Stitching
Flatlock stitching is an improvement over overlock stitching. This method involves overlapping the neoprene panels and then stitching them together in a flat, zig-zag pattern. While it’s not entirely waterproof, flatlock seams are generally more durable and comfortable than overlock, with no raised edge to cause chafing. This type of seam is usually found in 2mm wetsuits like springsuits or in thinner full wetsuits.
- Water Temperature Suitability: Flatlock stitching is suitable for water temperatures between 60°F and 70°F (15°C and 21°C), often used in warmer waters.
- Durability Impact: Flatlock stitching offers improved durability over overlock but is still prone to water seepage, making it better suited for warmer climates.
3. Blind Stitching
Blind stitching is a popular seam type for colder water wetsuits (can also be referred to as sealed seams). In this process, the neoprene panels are glued together edge-to-edge, and then a needle is used to stitch halfway through the material without penetrating the full way through, creating a waterproof barrier. This technique reduces water entry, keeping you warmer in cooler waters.
- Water Temperature Suitability: Blind stitching is typically used for water temperatures between 50°F and 65°F (10°C to 18°C).
- Durability Impact: This seam is durable and significantly reduces water entry, making it a solid choice for more serious surfers and divers.
4. Glued & Blind Stitched (GBS)
Glued and Blind Stitched (GBS) seams (can also be referred to as sealed and taped seams) are a step up from traditional blind stitching. Panels are first glued together, then blind stitched for an additional layer of protection. GBS seams are excellent for cold-water activities as they limit water entry and provide excellent insulation.
- Water Temperature Suitability: GBS seams are suitable for water temperatures below 55°F (13°C) and are commonly used for cold-water wetsuits.
- Durability Impact: These seams offer outstanding durability and flexibility, which allows for freedom of movement and comfort in harsher environments.

5. Fluid Seams and Taped Seams
Fluid seams and taped seams (sometimes also referred to as sealed and liquid taped) represent the highest quality in wetsuit construction. With fluid seams, that involves applying a layer of liquid rubber over GBS seams to completely seal the stitching. Meanwhile taped seams use strips of tape over seams to reinforce and waterproof them. Both are designed to prevent water entry, keeping you as warm as possible in frigid water.
- Water Temperature Suitability: Both seam types are best suited for water temperatures below 50°F (10°C) and extreme cold.
- Durability Impact: Fluid and taped seams provide maximum durability, as they are completely sealed, making them ideal for frequent use in rugged conditions.
Wetsuit Seams and Their Impact on Warmth
The warmth of a wetsuit depends on the type of seam, as each type varies in how much water can seep through. The more watertight the seam, the less water gets inside, allowing your body heat to warm the trapped water layer between your skin and the neoprene—a feature key to wetsuit warmth.
- Overlock and Flatlock Seams: Allow water to pass through, making them less effective at retaining warmth. Overlock is best for warmer conditions, while flatlock provides slightly better insulation but is still more suitable for mild temperatures.
- Blind Stitching and GBS Seams: These types block most water from entering, keeping you warmer in cooler water. GBS seams are particularly effective, combining glue and blind stitching to create a watertight barrier.
- Fluid and Taped Seams: Ideal for cold water, these seams completely block water from entering, providing the highest insulation and warmth level.
Choosing the right seam is essential for staying comfortable based on the water temperature you’ll be diving or surfing in.
Durability: Which Wetsuit Seam Types Last the Longest?
Wetsuit durability is heavily impacted by seam type, as some seams are more resistant to wear and tear than others. For example, overlock and flatlock seams can weaken faster because they’re exposed and not entirely watertight, which can cause the seams to degrade more quickly.
- Basic Overlock Stitching: Suited for warm water use and casual wear. However, due to its minimal reinforcement, overlock stitching is less durable and may start to fray with frequent use.
- Flatlock Stitching: Offers slightly better durability and comfort due to its flatter, smoother design. Suitable for warm-water enthusiasts who dive or surf regularly but in moderate conditions.
- Blind Stitching & GBS Seams: More durable options that limit water penetration, making them better for active surfers or divers in colder waters. The GBS seam’s added layer of glue boosts durability and water resistance.
- Fluid & Taped Seams: These seams have the longest durability and provide the most resistance to wear, tear, and water seepage. Fluid and taped seams are highly recommended for frequent cold-water users.
Choosing the Right Seam for Your Needs
The best wetsuit seam type for you depends on the water temperatures you frequent, the level of durability you need, and your budget. Here’s a quick guide to help you choose:
- Warm-Water Enthusiasts (65°F and up): Overlock or flatlock seams are economical and comfortable for warm water but won’t keep you warm in colder conditions.
- Moderate Temperature Diving (60°F to 65°F): Flatlock or blind stitching will provide the necessary warmth while offering good flexibility and comfort.
- Cold-Water Surfing or Diving (55°F and below): GBS, fluid, or taped seams are ideal for withstanding cold temperatures, with excellent water resistance and durability. These suits may cost more, but they’re worth it if you plan to dive or surf in colder conditions.
Conclusion: Picking the Right Wetsuit Seam for Warmth and Durability
Choosing the right wetsuit seam type impacts your comfort, warmth, and the suit’s longevity. Warm-water divers and surfers may find overlock or flatlock seams sufficient, while cold-water enthusiasts need the added insulation of GBS or taped seams.
With advancements in wetsuit technology, finding the perfect combination of warmth and durability has never been easier—just remember to match the seam type to the water temperatures and conditions you’ll be in most often. By investing in a wetsuit with the right seams, you’re ensuring a more enjoyable and lasting experience on the water!