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Sock maker near Braga, Portugal, producing about 3.5 million pairs a year in organic cotton and merino for department stores, chains and brands such as Asket.

Vertically integrated knitwear maker in Pithampur, India, built around its own organic and Fairtrade cotton farming program, spinning, knitting and dyeing for international brands.

Italian maker of fabrics and yarns for fashion, including the Albini 1876 and Thomas Mason labels.

Mount Airy, North Carolina wool sock mill that knits merino socks for private-label clients such as REI and L.L.Bean, makes licensed lines, and owns Farm to Feet; some programs use synthetic yarns.