One-Size Stretch Knits

articles made of synthetic stretchable threads. Because of the ease and degree of elasticity, a one-sized stretch-knit article can replace several different sizes. For the most part, stretch threads (elastic) are used in producing knitted articles (socks, gloves, sports suits, and so on). Elastic is basically made of polyamide and polyester fibers which are known for strength against tearing, for resistance against repeated deformations (stretching, bending, wearing), for resiliency, for thermoplasticity, and for the ability to keep their elasticity throughout the use of the article. Elastic is usually made by winding the fibers from 2,500 to 4,000 times per meter, heat-treating them in the twisted form, and finally unwinding them in the opposite direction. As a result of this treatment, the threads become spiral shaped, stretchable (to 400 percent), fuzzy, and bulky.

One-size stretch knits are close to natural-fiber articles in thermal and hygienic properties, since the loose and porous structure of the threads contributes to heat retention and to absorption and evaporation of moisture released by the body. The attractive appearance, durability, and comparatively low cost account for the great demand of stretch knits.