Merino wool is a super fiber, adaptable and naturally renewable. Unlike synthetic fibers derived from petroleum, merino wool keeps you comfortable in any climate. Its versatility means there's a bewildering array of blends and options to choose from.

We’ve tested these products over months and even years: Wool & Prince boxers, more hoodies, and the Ibex women’s Goat short sleeve. Prices and links have been updated for 2026.

Merino wool steals a sheep's ability to thermoregulate, keeping you warm in cold and cool in heat. A single sheep can produce 4-5 pounds of wool per year, making it sustainable and soft due to its thinner, evolved fibers. Nuyarn, a merino/synthetic hybrid, offers warmth and lightness.

Care instructions usually advise washing cold and laying flat to dry. Hand-washing extends the life of very lightweight garments, but some, like Minus33's Microweight Raglan short sleeve T-shirt, can be machine washed. Moths are a concern; store your garments properly to avoid damage.

Should you choose 100 percent merino or a blend? It depends on the garment and use case. Blends offer stretch for active pursuits, while 100 percent wool is preferred for heavier mid-layers like hoodies or jackets. Alpacas are an alternative if you find merino itchy; their fibers are thinner and finer.