Pajamas and many undergarments, usually have elastic that is stitched directly to the fabric and the elastic is worn against the skin. This underwear and pajama elastic will stretch and return to it's original size and shape for it to be comfortably worn. Made of 84 percent polyester and 16 percent rubber. Machine washable/dryable in temperatures up to 200 degree Fehrenheit. Available in white color. Measures 45-Inch length by 1-Inch width.