Proud to offer the best Cotton threads in the world! Variegated Pearl Cotton is a highly mercerized, OEKO-TEX and ISO certified, non-divisible, soft, breathable, lustrous , 100% Egyptian long Staple cotton thread. the thread is combed, singed by flame and then double mercerized. It is this double mercerizing which gives it its beautiful pearlized sheen. The thread is soft, silky, does not fluff or kink, and 100% colorfast. Available in multiple colors and sizes.