My knees have strong opinions about cold, wet descents. After blowing out my left one a few years back and switching from day hikes to slower, more deliberate backpacking trips, I started paying a lot more attention to base layers. A soggy cotton underlayer on a rainy ridge above Rainier taught me that lesson the hard way. So when I picked up the LEADHALO 100% Merino Wool Base Layer Set to test through a run of drizzly fall weekends in the Cascades, I had low patience for anything that didn't earn its spot in my pack.
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What I noticed first
The softness caught me off guard. I've handled a lot of merino over the years, and budget-tier merino often has a scratchy edge to it, the kind that's fine over a T-shirt but starts to bite after a few hours against bare skin on your chest or lower back. This one doesn't do that. I pulled the top on in my kitchen the morning before a trail day and just, sort of forgot I was wearing a base layer. That's genuinely the best compliment I can give.
At 250 g/m², this sits solidly in midweight territory. It's not a featherweight liner you'd wear in May, and it's not a heavyweight you'd sleep in during a January car camp. It lives in that sweet spot for shoulder-season hiking and cool-weather backpacking, which is honestly where I spend most of my time anyway. The fit on the large ran a little slim through the torso for me, so if you're broad-shouldered or carry a pack hip belt that sits high, keep that in mind.
What didn't click
Here's my honest gripe: the care instructions require hand washing or a delicate machine cycle, and on a multi-day trip that's a moot point, but it does mean I'm being careful at home in a way I'm not with some of my other merino pieces. More practically, I'd have liked to see flatlock seams on the bottoms. The seams on the pants aren't offensive, but after a full day on trail with a pack on my hips, I noticed some faint chafing along the waistband stitching. Nothing that drew blood, but enough that I layered thin liner shorts underneath on longer days.
There's also no listed weight for the set, which matters when you're counting ounces. LEADHALO doesn't publish a packaged weight that I could find, so if you're a gram-counter building a spreadsheet, you'll need to toss it on your own scale before committing.
And pricing is a bit of a question mark since I couldn't pull a live price at time of writing. Check the current listing on Amazon before assuming it sits in budget-merino territory, because that affects the value calculation pretty significantly.
What works
The odor resistance is real. I wore the top for three consecutive days on a Wonderland Trail segment, and it came out the other side smelling like, well, trail, but not like the synthetic base layer I left at home would have. Merino's natural odor management isn't magic, but it's meaningfully better than polyester, and LEADHALO's wool behaves exactly like you'd expect good merino to.
Temperature regulation is the other win. On a climb with a loaded pack, I was generating serious heat, and the top vented well enough that I didn't stop to peel a layer. Then on a long lunch break in the shade with wind picking up, it kept me comfortable without me digging for my mid-layer immediately. That's the promise of merino, and this set delivers on it.
The bottom half is genuinely comfortable as a standalone layer around camp, too. I've worn it reading in a tent, doing camp chores, and even on an early-morning summit push where I didn't want to add bulk. Slim enough to layer under softshell pants, not so tight it feels restrictive when you're stepping over blowdowns.
If you're on the fence, I'd say the top is the stronger piece of the two. The bottoms are good, but the top is the one I keep reaching for first. Grab the set on Amazon and decide for yourself, since individual pieces aren't listed separately as far as I can tell.
| Pros | Cons |
|---|---|
| Genuinely soft, itch-free feel against bare skin | Waistband seam caused minor chafing on long days |
| Solid odor resistance over multi-day use | No published weight for the set |
| Good temperature regulation during variable effort | Requires delicate washing care |
| Fits slim enough to layer cleanly under softshells | Torso fit runs a touch narrow for broader builds |
| Top is a standout piece on its own merits | Price not publicly confirmed at time of review |
Merino base layers aren't the flashiest gear purchase, but they're the ones I stop noticing because they just work. That's where the LEADHALO set lands for me, mostly. It's not a boutique brand with decades of merino credibility behind it, and I won't pretend it replaces my Icebreaker top for heavy-use days. But for a newer brand, the wool quality surprised me, and the top especially has earned a regular spot in my pack rotation through the wet PNW shoulder seasons. Give it a try if you've been priced out of the premium merino market and don't want to settle for synthetics. You might be as pleasantly surprised as I was., Dave