The Tracksmith Harrier Long Sleeve is the nicest long-sleeve running top I own. I wear mine in navy, in a medium, on easy and long runs when it’s about 45 to 60°F, and it’s clearly better than the other long sleeves in my drawer.
The short answer: it’s worth having one for colder weather, but at $110, I wouldn’t make a habit of buying running tops at this price. One great merino layer makes sense. A whole drawer of them is harder to justify.
Best merino running top for cool weather
Tracksmith Harrier Long Sleeve
A soft, relaxed merino blend top that handles sweat well and stays comfortable as you warm up.
Tracksmith Harrier Long Sleeve Review: Quick Verdict
Four things stand out, and it’s hard to pick just one: the fabric is soft, it handles sweat well, it stays comfortable as I warm up, and it looks good.
Price is my only real complaint. At $110, it’s a treat rather than an everyday purchase, even though it beats my cheaper tops.
Tracksmith Harrier Long Sleeve specs
| Spec | Value | Note |
|---|---|---|
| Price | $110 | |
| Fabric | 50% Merino / 41% 37.5 Nylon / 9% Nylon | 17.5-micron Merino, 205 gsm |
| Fit | Relaxed, raglan sleeves, crew neck | Tracksmith's most relaxed technical long sleeve |
| Cuffs | Thumbholes | |
| Men's sizes | XS to XXL | |
| Men's colors | Navy, Racing Red, Purple Velvet, Golden Brown/Narcissus Stripe | |
| Care | Cold delicate wash, lay flat to dry | No bleach or softeners |
How It Feels on a Run
I’ve used mine on easy and long runs, and it’s a very comfortable top for spending time on your feet. It feels soft from the first step, and it doesn’t cling or feel wet and heavy when I start sweating.
The biggest difference from my other long sleeves is how comfortable it stays over the course of a run. In the cool weather I’ve worn it in, it has been enough on its own, including once I’ve warmed up.
The fabric explains a lot of this. The Harrier is a Merino blend with 50% wool and nylon made with 37.5 Technology, which Tracksmith says helps with temperature regulation and moisture. It’s also a heavier knit than earlier versions, and Tracksmith designs it for cool to cold conditions.
Fit and Sizing
The Harrier fits true to size with a relaxed cut. My usual medium has some room through the body, which fits Tracksmith’s description of it as its most relaxed technical long sleeve.
If you want a next-to-skin base layer, this isn’t that kind of top. If you want something comfortable with a less clingy look, the relaxed fit is a plus.
What Temperature Is It Good For?
I’ve worn mine on its own at about 45 to 60°F, and that’s where I’d start. Tracksmith says it’s designed for cool to cold conditions, and the thumbholes add some coverage when it gets colder.
For the rest of a cold-weather kit, I wear the Tracksmith Fells Tights on colder runs and the Tracksmith Inverno Gloves down to about 30°F. For a cheaper merino base layer on cold runs, I use the Merino.tech 165 and the warmer Merino.tech 250.
Is the Tracksmith Harrier Long Sleeve Worth $110?
For one top, yes. It’s clearly better than my other long sleeves, and I’m glad to have it for colder runs. I just wouldn’t buy a whole rotation of running tops at this price, and I don’t think most people need to.
Buy it if you run regularly in cool weather, you value soft fabric and a relaxed fit, and you want one really good layer that also looks good.
Skip it if you want a tight base layer, you run mostly in warm weather, or spending $110 on a running shirt would bother you every time you wore it.
Tracksmith Harrier Long Sleeve FAQ
Does the Tracksmith Harrier Long Sleeve run true to size?
It does for me. My usual medium fits with a relaxed cut and some room through the body.
Is the Harrier Long Sleeve warm enough for winter?
I’ve worn it on its own at about 45 to 60°F. It’s designed for cool to cold conditions, but in colder weather, plan on adding layers based on how warm you run.
What is the Harrier Long Sleeve made of?
The men’s body fabric is 50% Merino wool (17.5 micron), 41% 37.5 nylon, and 9% nylon, at 205 gsm.
Does the Harrier Long Sleeve have thumbholes?
Yes. There’s a thumbhole on the inside seam of each cuff.
How do you wash the Harrier Long Sleeve?
Tracksmith says to machine wash it cold on a delicate cycle with like colors, avoid bleach and softeners, and lay it flat to dry.
Is there a women’s Harrier Long Sleeve?
Yes. Tracksmith also sells a women’s Harrier Long Sleeve at the same $110 price.
