Pros and Cons of Sewing With a Heavy-Duty Polyester or Nylon Thread

Written by emily weller
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Pros and Cons of Sewing With a Heavy-Duty Polyester or Nylon Thread
The pros of using polyester thread outweight the cons. (thread image by Andrius Grigaliunas from

The type of thread you pick to sew a garment or tote bag may seem like a small thing, but it can make a big difference in the quality of the finished product. A thread's material determines the way it can be used in sewing. For instance, cotton thread can withstand the heat of an iron and so can be used on garments that will require frequent pressing. Cotton thread does not stretch well, so polyester thread works best for knit garments.

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Pro: Strength

Heavy duty polyester thread is more durable and less prone to breakage than cotton thread. A garment that will see a lot of wear and tear or that will be laundered often will last longer if it is sewn with polyester thread. You should also use heavy-duty polyester thread when sewing chair covers or throw pillows.

Pro: Flexibility

Both polyester thread and nylon thread will stretch along with the fabrics they are holding together. Use polyester or nylon thread to sew together knit and other stretchy fabrics to prevent the seam from ripping when the garment stretches.

Pro: Fade- and Dye-resistant

Nylon thread will not fade in the sunlight and is great to use in curtains and other sewn materials that will be frequently exposed to the sun. Both polyester and nylon thread are dye-resistant and are used to create designs in resist-dyeing techniques, such as shibori.

Con: Heat Can Damage Thread

Heavy-duty polyester or nylon thread may melt or weaken if exposed to the hot temperature of an iron and so should not be used on fabrics that need frequent pressing, such as woven cotton or linen. Nylon thread may be more prone to melting than heavy-duty polyester thread.

Con: Nylon Is Not Very Durable

While heavy-duty polyester thread will not wear out, nylon thread is a bit more frail. Nylon thread will become brittle and may break if used on a garment that will be washed a lot or that will see a lot of wear.

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