Elastane, also known as spandex or Lycra, is a synthetic fiber commonly used to provide stretch in fabrics. While elastane offers various benefits in terms of stretch and comfort, it does have environmental considerations. By avoiding the use of synthetic stretch like elastane, fabrics with natural stretch can be considered more environmentally friendly. Bouncy cotton is 100% pure cotton without any elastane and is typically biodegradable as well as having a lower environmental impact compared to synthetic stretch fibers.