Men's Running Shirts On

Men's On Merino Long-T


The On Merino Long-T looks like a regular long-sleeve shirt, but is much more comfortable and has amazing performance qualities.

On Swiss-engineered this top with special spinning technology to spin fine polyamide yarn around Merino wool. The result is a fabric that has the amazing qualities of Merino wool—it is incredibly soft, keeps you cool in the summer, warm in the winter and the natural antimicrobial properties keep you odor-free. Plus, it is more durable, abrasion-resistant and lighter weight than typical Merino tops.

Not only does this top feel amazing on your body, but you can feel good about wearing it. It features mulesing-free wool, which means that the fleeces are humanely sheared. Whether you are backpacking in the woods or running your first half marathon, be ready for any adventure with the On Merino Long-T.


Size S M L XL
Chest (in) 35-37 38-39 40-41 43-44
Waist (in) 30-31 33-34 35-36 37-39
Hip (in) 35-37 38-39 40-41 43-44

How You Can Wear It

Because of its amazing merino wool properties, you can wear the On Merino Long-T with shorts in the summer to protect your arms from the sun or layer it under the On Weather Jacket with pants for those cold, snowy runs.

Materials & Sustainability

83% Merino wool, 17% Polyamide

100% mulesing free


Machine wash cold. Do not tumble dry, iron, dry clean or bleach.

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