In the field of sewing threads, leather and shoes are specific applications that require special attention due to the unique characteristics of these materials. Leather is a natural material known for its durability, strength, and aesthetics. For sewing leather, special threads are used to ensure strong and resilient seams. These threads must be sufficiently resistant to tension to withstand the stresses that leather may be subjected to, while also being flexible enough to adapt to the curves and contours of the material. Polyester and nylon threads are often preferred for sewing leather because of their strength, durability, and ability to keep seams in place even under demanding conditions.