24/7 Cotton is a worsted weight yarn made from 100% mercerized cotton in vibrant colors. The mercerization process gives the yarn incredible color, magnificent stitch definition, and a sheen that will last through multiple wash cycles. Fiber Content: 100% Mercerized Cotton; CYC #4 Medium. Care Instructions: Machine Wash & Dry. Each skein weighs 3.5 oz/100 g; Each skein measures 186 yd/170 m.