These fibers are superior to rubber because they are stronger, lighter, and more versatile. In fact, spandex fibers can be stretched to almost 500% of their length. This unique elastic property of the spandex fibers is a direct result of the material's chemical composition. ... They intermingle and make the fibers soft.

What makes spandex stretchy?

Spandex is made of synthetic polymer called polyurethane which has extraordinary stretch ability. The long chain of polymer is produced by reacting polyester with diisocyanate which contains at least 85% polyurethane. Spandex is strong, durable and was first invented at DuPont's laboratory in 1959, in Virginia.

Is spandex material stretchy?

Spandex is a synthetic fabric that is prized for its elasticity. ... The terms spandex, Lycra, and elastane are synonymous. This fabric can stretch to 5-8 times its normal size, and it is commonly used in form-fitting consumer apparel.