Our solid KLUE socks will become your favorite everyday socks because we have developed the best combination of durability, comfort, and eco-responsibility. Durability: Our socks are ethically made from 80% organic Aegean cotton, known for its strong and smooth fibers offering great durability. Their vibrant colors will last for years thanks to our OEKO Tex Standard 100 certified manufacturing partners. Comfort: Organic Aegean cotton is one of the strongest and softest cottons in the world. The elastic at the ankle is tight enough to stay up but light enough not to leave a mark. Eco-responsibility: Our socks are made in European workshops certified OEKO-TEX Standard 100 and GOTS, BSCI A, maintaining an environmentally friendly manufacturing process that guarantees ethical working conditions and employee rights. Available in 2 sizes : EU : 36-40 - 41-46 US : 5-8.5 - 9.5-12.5 UK : 3.5-7 - 7.5-11