Merino wool base layer brands

Merino is the default fiber for base layers. It's fine enough to wear against skin, warm in the cold, comfortable across a wide range of temperatures, and slow to hold odor. These are the brands in the directory that make merino base layers. Many blend in a little nylon or elastane for durability and stretch; each listing says whether a brand is 100% natural.

• Aclima (Drammen, Norway): 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.
• Devold of Norway (Langevåg, Norway): Historic Norwegian wool brand making merino wool base layers, underwear, sweaters, jackets, pants, socks and accessories for outdoor and everyday wear.
• Duckworth (United States): Montana brand making US-made merino wool shirts, base layers, sweatshirts, jackets and socks from wool grown on the Helle family ranch and Rocky Mountain growers.
• Ibex (Boulder, United States): Merino wool outdoor clothing — base layers, socks and jackets — founded in Vermont in 1997, now based in Boulder.
• Icebreaker (Auckland, New Zealand): Merino outdoor and base-layer clothing; some fabrics blend merino with nylon, lyocell or elastane.
• Isobaa (United Kingdom): UK merino wool brand making tees, hoodies, base-layer tights, joggers, boxers, socks and beanies for running, outdoors and everyday wear; ships to the US.
• Minus33 (Ashland, New Hampshire, United States): Merino wool base layers, socks and hats from a fifth-generation New Hampshire woollen textile family business.
• Mons Royale (Wānaka, New Zealand): New Zealand merino performance apparel brand making base layers, mid-layers, bike and ski wear, underwear, socks and accessories from New Zealand merino.
• Point6 (Chattanooga, United States): Merino wool sock brand made in Chattanooga, Tennessee, with New Zealand merino socks plus merino tops, base layers, underwear and beanies.
• Ramblers Way (United States): New England brand making American-made merino wool base layers and essentials for men and women.
• Smartwool (United States): Colorado outdoor brand that pioneered merino wool ski socks, making merino socks, base layers and apparel using ZQ-certified merino.
• Woolx (Endicott, United States): Family-run New York brand making merino wool tees, sweaters, base layers, leggings, dresses, sleepwear and socks from ultrafine non-mulesed Australian merino.

Comparing fibers? Read alpaca vs cashmere vs merino, or browse all merino brands and natural fiber base layers.