How do you verify the seam strength of activewear designed for high-intensity training?

We implement Four-Needle Six-Thread (Flatlock) stitching for most high-performance items. This technique creates a physical bond that matches the elasticity of the fabric itself, preventing seam failure during maximum extension. Each production batch undergoes tension testing to ensure the seams meet the required Newton-meters of force without structural compromise, while maintaining a low-profile finish to prevent skin chafing.