Flatlock seams are a type of stitching used in textiles, particularly in activewear and sports clothing. This technique involves joining two pieces of fabric together in a way that creates a flat, smooth surface on both sides. This design minimizes bulk and reduces the risk of chafing, making it ideal for garments that require comfort during movement. The flatlock seam is created using a specialized sewing machine that allows the edges of the fabric to be aligned and stitched without overlapping. This method is commonly found in athletic apparel, swimwear, and underwear, where flexibility and comfort are essential for performance.