Woolly Nylon most often used in the loopers of an overlocker. It is a strong stretchy thread made up of very loose fibres, hence the name woolly, that is very thin when elongated. The construction of Woolly Nylon makes it perfect for very stretchy fabrics such as swimwear, dance, or sportswear. It creates a very soft finish, so it is very gentle on the skin, preventing chafing on activewear seams. Woolly Nylon can also make a lovely decorative finish on seams or rolled hems.