What is the difference between Flatlock and GBS?Updated 10 days ago

The type of seam construction used in a wetsuit plays an important role in its warmth, flexibility, durability, and overall performance. The two most common seam constructions are Flatlock and GBS (Glued and Blind Stitched).

What Are Flatlock Seams?

Flatlock seams are created by overlapping the neoprene panels and stitching them together. The stitching passes completely through both layers of neoprene, creating a strong, durable, and comfortable flat seam.

Benefits of Flatlock seams:

• Durable and hard-wearing construction
• Flexible and comfortable against the skin
• Breathable design that allows some water movement through the seams
• Ideal for warm-water wetsuits

Because the needle passes through the neoprene, small amounts of water can enter through the seams. For this reason, Flatlock construction is typically used in wetsuits designed for warmer conditions.

What Are GBS (Glued and Blind Stitched) Seams?

GBS stands for Glued and Blind Stitched. In this construction, the neoprene panels are first glued together edge to edge. They are then stitched using a curved needle that only penetrates partway through the neoprene, without passing completely through the material.

This creates a seam that is stronger, more flexible, and significantly more water resistant than Flatlock construction.

Benefits of GBS seams:

• Reduced water entry through the seams
• Improved warmth and insulation
• Strong and flexible construction
• Ideal for cool and cold-water conditions