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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.

Spinner of natural-fiber yarns in cotton, silk, linen, cashmere and alpaca for knitting and weaving.

British outerwear brand famous for the duffle coat, making wool-rich duffles, peacoats and overcoats in England, including Harris Tweed styles.

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.