Woolly Nylon Extra is our serger thread made from extra-bulky textured nylon that stretches with your fabric. This fluffy looper thread provides exceptional coverage of seam edges on garments, lingerie, and swimwear. Woolly Nylon Extra is perfect for bulky fabrics, including fleece, and when you want extra heavy coverage. Unlike spun thread, its crimped texture creates soft, comfortable seams that won't irritate skin and remain secure even after repeated wash cycles. Each cone contains 328 yards of thread.