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Merino wool socks (blended with nylon for durability) made in Northfield, Vermont, with a lifetime guarantee.

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.

Irish linen weaver since 1912, operating from what it calls Ireland's oldest remaining linen mill, with its own dyeing and finishing works.

Norwegian wool brand making merino wool base layers, thermal underwear, fleece-wool layers and beanies, using New Zealand merino knitted in its own Estonian facility.