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15.5μm MERINO × SEAMLESS TECHNOLOGY

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Lightweight, flattering, and powered by 15.5µm ultrafine Merino. Designed for comfort, performance, and style.

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Performance essentials in next-gen Merino. Soft, breathable, and built for movement—on and off the trail.

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Discover award-winning Merino designs where zero-waste innovation meets timeless outdoor function.

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COZY ZERO

Elevate Your game with cozy zero tech merino seamless active wear.

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Mackenzie W.

nice and comfortable lightweight shirt!

This is such a nice and comfortable lightweight baselayer shirt! I wore it while hiking in the Italian Dolomites and it kept me just warm enough in the cool moments and plenty cooled in the hot moments. Super soft texture and really breathable, I didn’t notice my sweating all day. The sizing fits true with a tighter fit—I’m usually a Medium and got a Medium and it was perfect. if you want extra tight I would size down but I thought it was comfortable and looked great.

Women's PerformaWool Aero Weight Tee

Laura K.

Perfect for spring runs!

This top is perfect for cool spring runs. The color is beautiful. The fabric is soft but breathable. I need to buy all the colors!

Women's PerformaWool Aero Weight Tee

Amber C.

Super Comfortable!

I wear this tee running and it’s super comfortable even in warm/humid conditions. The fabric is light, breathable, and good quality. I like that it’s not too thin so even a light color has good coverage. I was surprised at how well I liked the slightly longer sleeve. At 5’4 140#, the medium was a good fit for me.

Women's PerformaWool Aero Weight Tee

Sydney P.

My new favorite running tee

I’ve gone through so many running shirts that stink after just one workout, but this one doesn't. The merino blend handles sweat like a pro and stays fresh way longer than my old polyester tees. It’s high-quality but doesn't look too 'sporty,' so I can easily wear it for errands after my run. Also, the Light Gray is such a beautiful, classic neutral—it goes with everything!

Women's PerformaWool Aero Weight Tee

Karen B.

Love the lightweight feel of this tshirt

Love the lightweight feel of this tshirt, feels
Great to work out without weighing me down and is so breathable without any stink!
Also smart enough to wear just as casual wear.

Women's PerformaWool Aero Weight Tee