These are premium, fairly-traded, Peruvian Pima cotton socks! All styles of Pima socks are custom Pokoloko designs created in collaboration with the entire Poko team's input.  Peruvian pima cotton is hand-harvested, which means the production process has a much-reduced impact on the environment compared to a machine-based harvesting production process. It is hypoallergenic for those with sensitive skin, and it's breathable and moisture-wicking for those active sock-lovers. Coffee is life.    Materials 80% Cotton/Coton 15% Nylon, 5% Spandex Measurements S/M: wmns 5-9 mens: 4-8.5 L/XL: wmns: 9.5-12 mens: 9-14 Unisex Suitable for all Origin Peru