Our eco friendly socks are our absolute favorite socks! (our customers and family members too!) Everything in this cateogry is Made in the USA and is made with regenerated cotton. What is regenerated cotton? Regenerated cotton is made up mostly of unused cotton fabrics that is tossed away during the apparel making process. Using this type of yarn saves water, requires only 15% new materials and that small percentage is dyed under Oeko Tex 100 certification.