100% long staple Egyptian cotton, mercerized and shrink-fast, solid dyed in both White and Ecru. Our Ecru is very different from basic ecru. Less expensive "natural" ecru crochet cotton is undyed, so may lose its color through washing and over time. Fincrochet Ecru is bleach-fast, solid dyed color C3000, which guarantees its exact color for a lifetime. Fincrochet is clearly the best choice for heirloom quality crochet.