I Wore YESWEL Merino Wool Base Layers on Two Multi-Day Treks. Here's What Stuck.
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A damp October weekend in the Smokies taught me more about base layers than any gear forum ever did. After two days of steady rain and temperatures hovering just above freezing, I watched my synthetic top quit. It held moisture against my skin like a wet blanket and didn't dry until I was back at the trailhead, shivering in my car with the heater cranked. That was the moment I started hunting for something better. I picked up the YESWEL 100% Merino Wool Base Layer set before a long section hike last spring, and I've been running it on longer trips ever since.
The YESWEL set is a two-piece deal, a long-sleeve top and full-length bottom, built from what the brand calls 180g/m² 100% merino wool. No blends, no synthetic backing. For a gram counter like me, that matters. Every layer of synthetic in a base layer is potential后悔 on a wet week. Pure merino handles moisture differently, moves it away from skin and lets it evaporate without turning into a clammy penalty.
Best fit if…
This is the set I'd point a fellow hiker toward if they're looking for a single base layer rotation that handles cool-to-cold shoulder seasons without babying. The fit is snug, not compression-tight, but close enough that it layers cleanly under a midlayer or rain shell without bunching. I wore it under a wind shell on a breezy alpine crossing at altitude and never felt the fabric shifting around.
It's also a solid pick if you want one set that works on-trail and off. YESWEL markets it for skiing, hunting, and indoor fitness, and honestly, it doesn't look out of place at a coffee shop after a hike. That's a minor thing, but I appreciate gear that doesn't scream "I live in a tent." The fabric has a soft, almost suede-like hand that doesn't feel scratchy next to skin, even straight out of the package. No itch factor worth mentioning, which isn't always a given with 100% merino at this price point.
If you're a warm sleeper or doing a low-elevation summer thru-hike, though, I'd look elsewhere. This is a genuine cold-weather piece. On a 55°F day with sun exposure, I was overheated within an hour of hiking. It's built for the workhorse days, damp mornings, crossing snow line, that half-hour before your body heat kicks in.
Compared to what I'd used before
Before switching to the YESWEL set, I ran a synthetic blend base layer for most of my 2022 and 2023 seasons. It was functional and cheap, but it started holding onto odor around day four on-trail. Merino doesn't solve everything, but it does stay fresher longer, and after weeks in the backcountry, that matters more than you'd think when you're rationing pack laundry.
I've also worn a pricier named-brand 200g merino top on the PCT, and honestly the YESWEL fabric feels comparable in softness. I'm not going to pretend I've run lab tests on fiber diameter or micron counts, I don't know those numbers for this product. What I can tell you is that after multiple wears and washes, the YESWEL top hasn't developed the thin patches I saw in my old base layer after a single season. The elasticity has held up well, and the fabric hasn't sagged at the elbows or knees.
One thing I noticed immediately: the tag in the collar is aggressively stiff. I clipped it out on the first wear. If you have sensitive skin around your neck, factor in thirty seconds with scissors before you head out.
How it held up
After a combined six weeks of use across two different section hikes, the YESWEL set looks and performs like it did out of the package. The top and bottom have both been machine washed, I use a gentle cycle and hang them dry, which the care instructions support, and neither has lost shape or gone pilly. The fabric surface is still smooth.
The moisture-wicking behavior is the real test on-trail, and it passes. On a dewy morning descent where my rain shell let in more ambient moisture than I'd have liked, the base layer underneath stayed surprisingly dry against my skin. It took the hit from the outside and moved what little sweat I was generating outward without that wet-cling feeling. That's exactly what I want from any base layer, and too many don't deliver.
What I didn't love, and I'll be direct about this, is that the bottom's waistband rolled inward slightly after a few washes. It's not a dealbreaker, but on a long day with a hipbelt digging in, I noticed it and had to adjust. It's the kind of small manufacturing inconsistency you sometimes get under a certain price point, and it's the main reason I'm not calling this a perfect set. Merino quality can vary between production runs, so your mileage may differ from mine on fit consistency.
For the weight-conscious, the two-piece setup lets you carry just the top on warmer stretches and drop the bottom when conditions shift. My scale has the full set at a reasonable trail weight for 100% merino. I wouldn't blink at carrying it on any multi-day route where temperatures could swing.
If you're building a cold-weather layering kit and don't want to drop serious money before you know what works for you, the YESWEL set is worth a look. It isn't fancy, but it does the job without drama. I've recommended it to a couple trail friends, and I'll keep it in my rotation.
— Lena