If you are looking for threads to sew lots of layers or some fairly thick or stiff fabrics, Rongdu has the very thread that is heavy duty thread. There are a wide array of applications including footwear, leather goods, luggage and bag, furniture upholstery, mattress, sports equipment, denim, automobile, canvas, tent, wire and cable applications, filtration and more.
Tex size is the weight in grams of 1,000 meters of a continuous filament polyester thread. For example, a thread marked as tex 70 means that the weight of 1000 meters of thread is equal to 70 grams
Denier size is the weight in grams of 9,000 meters of a heavy duty thread. For instance, if 9000 meters of thread weighs 210 grams, then the denier size is 210D.