For our Cotton Lisle socks, Pantherella use the nest extra-long staple Egyptian grown cotton. This yarn is composed of two strands that are twisted together, with extra twists per inch than lesser quality cottons, creating one single, strong thread. Once spun, the cotton goes through a process of Mercerisation to increase durability. The result is a shiny, shrink & pill resistant yarn that absorbs colour brilliantly while maintaining its silky lustre.