Textured Polyester Serger Threads

"Woollie-like" nylon thread is a common thread used in the loopers of a serger or overlock machine. It is fluffy, has good elongation and stretch recovery, but is not heat resistant, can fade over time, and can turn brittle. Textured Polyester is a polyester version of "woollie-like" nylon serger thread. Great stretch, coverage, and a higher heat-resistance, our textured polyester threads have the traits you like in "woolly-like" nylon threads, but has the additional benefits that polyester fibers offer.

Both of our textured polyester threads, Polyarn and ProLock, are made to be used in the looper of a serger. Textured polyester threads are used for rolled hems and for sewing on stretchy materials, such as spandex, lycra, or swimsuit material. Textured polyester threads provides better stitch coverage compared to spun polyester or filament polyester threads thanks to its fluffiness and ability to recover once stretched.

Our textured polyester serger threads:

Polyarn

Tex 26 texturized polyester thread. Designed specifically for serger and overlock machines. Polyarn is a premium “woollie-like” texturized polyester thread. Polyarn has excellent elasticity, recovery, and flexibility, which makes Polyarn the top choice for garment construction when sewing on a serger. Because Polyarn is 100% polyester, it has a higher heat resistance than woollie nylon threads. These beautiful colors are colorfast and can be commercially laundered without risk of fading. With its excellent coverage, Polyarn can be used for simple hems or fancy stitching.

ProLock

Tex 35 texturized polyester thread. Designed specifically for serger and overlock machines. ProLock is a new texturized polyester thread (DTY) designed for serging on fleece, knits, and stretch fabrics. Available in 60 colors, ProLock is colorfast and can be commercially laundered without risk of fading. With the bulk, elasticity, and flexibility popularized by “woollie-like” nylon threads, ProLock has all these traits plus the addition of higher heat-resistance.

What is the difference between Polyarn and ProLock?

Polyarn is the recommended thread when stretch is critical. It has 50% more stretch than ProLock and is more widely-used in stretchy apparel fabrics such as swimsuits and leotards. ProLock is stronger and has better coverage. However, it does not have better stretch than Polyarn. ProLock is widely-used for serging when stretch isn't critical.

Watch our serger video series with Sue Green-Baker