Wetsuit seams play a critical role in determining the overall warmth, durability, and comfort of the suit. The two most common types of seams used in wetsuit construction are flatlock stitching and glued and blindstitched (GBS) seams.
Each method has unique characteristics and performance in different water temperatures
Flatlock Seams
Flatlock stitching is a method in which two pieces of neoprene (wetsuit material) are overlapped and then stitched together using a multi-needle machine. This creates a flat seam that lies flush against the skin, reducing irritation and chafing.
The stitching appears on both the inside and outside of the wetsuit, creating a strong and flexible bond between the panels.
GOOD POINTS:
- Durability: Flatlock seams are extremely durable and strong, making them a good option for wetsuits that will be subjected to high levels of wear and tear, such as for surfing or diving.
- Flexibility: The stitching technique used allows for good flexibility and movement, which is important for water sports that require a wide range of motion.
- Cost-effective: Flatlock seams are easier and less expensive to produce than other types of seams, making wetsuits with flatlock seams more affordable.
BAD POINTS:
- Water Leakage: Flatlock stitching punctures the neoprene fabric, which creates small holes through which water can enter the wetsuit. This makes flatlock seams less effective at keeping water out and maintaining warmth, especially in colder conditions.
- Best for Warm Water: Because water can seep through the seams, wetsuits with flatlock stitching are generally recommended for use in warmer water, typically above 18°C (65°F).
Flatlock seams are ideal warmer waters and lower cost suits.
Glued and Blindstitched (GBS) Seams
Glued and blindstitched seams are designed to create a watertight bond, making them superior to flatlock seams in terms of warmth and insulation. In this process, two pieces of neoprene are first glued together at the edges. After that, a blind stitch is used to sew the panels without fully penetrating the material. A blind stitch goes halfway through the neoprene, so it doesn’t create holes all the way through the fabric.
GOOD POINTS:
- Warmth: Because the stitching doesn’t penetrate all the way through the neoprene and the panels are glued together first, GBS seams are far more effective at preventing water from entering the wetsuit. This makes them ideal for use in colder waters.
- Comfort: Since the seams are less bulky and the stitching doesn’t penetrate the full thickness of the neoprene, GBS seams are more comfortable than flatlock seams.
BAD POINTS:
- Cost: The GBS process is more time-consuming and labor-intensive, making wetsuits with GBS seams more expensive than those with flatlock stitching.
- Durability: While GBS seams are designed for warmth and flexibility, they may not be as durable as flatlock seams in high-stress areas.
Comparison: Flatlock vs. GBS Seams
When comparing flatlock stitching to glued and blindstitched seams, the main differences lie in water resistance, warmth, and intended usage.
Flatlock seams are more affordable and durable but allow water to seep in, making them better suited for warmer water sports.
In contrast, glued and blindstitched seams are designed to keep water out and retain body heat, making them the preferred option for colder environments but at a higher cost.
In terms of flexibility, both flatlock and GBS seams allow for a good range of motion, but GBS seams are generally smoother and more comfortable against the skin.
Wetsuits seams can also feature 'Wetsuit Tape' and 'Liquid Seams' - check our blog post on Taped and Liquid Seams.