Allbirds now makes comfortable and breathable underwear from wool — here's what we thought after testing them out

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Allbirds

• Allbirds has launched its first-ever underwear collection, called Trino Undies, and it's made from soft Merino wool and eucalyptus tree fiber.
• Trino Undies are currently available in a variety of colors and five styles: Boxer Brief ($24), Thong ($16), Brief ($18), Shortie ($20), and a Bralette ($30). Sizes range from XS to 3XL.
• We had two reporters test out the pieces ahead of the launch and compare them to other popular options.
• You can find our full reviews below, but the quick version is this: the underwear is soft, breathable, and barely there, but we found that the bralette doesn't offer support for larger busts.

Allbirds is growing its collection of basics with a new line of underwear — called Trino Undies ($16-$30) — which is named for the same Trino material used in its popular socks.

Trino Undies are currently available in a variety of colors (from neutral Wheat to peachy Malibu) and in five different styles: Boxer Brief ($24), Thong ($16), Brief ($18), Shortie ($20), and a Bralette ($30). Sizes range from XS to 3XL in most styles. You can shop them all here.

The company prioritizes eco-friendly alternatives in all of its wardrobe staples, and now that includes underwear too. Trino fabric is made with soft Merino wool and the brand's eucalyptus material rather than traditional cotton or virgin nylon (which is made from petroleum). Merino wool is temperature-regulating and moisture-wicking enough that you'll see it show up in high-end running and hiking gear. It also allows Allbirds to use 60% less energy in comparison to typical synthetics when producing its products. Its tree fiber Tencel, which is silky-smooth and breathable, avoids harsh pesticides, minimizes fertilizer, and relies on rainfall — which means using 95% less water than traditional cotton.

We had two reporters test the Allbirds Trino underwear ahead of the launch. You can find our full reviews below, but the gist is this: the underwear is comfortable, breathable, and worth the price. It didn't dethrone our other favorites, but it is a noteworthy contender. However, we wouldn't suggest the bralette for larger bust sizes. If you need something that lends support as well as comfort, we recommend Lively bralettes.

And if you have a sensitivity to wool, the Trino Undies may not be for you. You can find all of our favorite men's underwear here and women's underwear here.