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Two Standout Autumn/Winter Pieces from Workman | X-SHELTER, "Insulation You Wear," and ¥1,900 Merino

2025.09.05

"Which of Workman's autumn/winter pieces actually work on a mountain?" Here's my honest answer.

Workman — a Japanese workwear chain that has become popular here for low-cost outdoor gear — invited me to their autumn/winter 2025 preview at the Tokyo International Forum. There were more new products on the floor than I could count, and two of them struck me as genuinely excellent for the season: X-SHELTER, which they describe as insulation you wear, and merino wool, the classic mountain fibre.

What actually matters on a mountain in autumn and winter is preventing the chill that follows sweat, and the quality of the warmth you get. These two address exactly those things, at prices that took me by surprise. Below: how each one works, what I noticed handling them, and who I'd recommend them to — without flattery. Both are sold in Japan.

From "Workman Joshi" to "Workman Colors"

The first thing I noticed on the floor was that the brand itself has moved on. The store banner has changed from #Workman Joshi ("Workman Girls") to Workman Colors, shifting away from a name that pinned it to one gender and age group toward something aimed at everyone's ordinary life.

The functional performance came out of professional worksites in the first place, and it now solves everyday problems — rain, wind, dirt, cold — at accessible prices. These two pieces are a good illustration of that shift.

X-SHELTER — insulation you wear

X-SHELTER was the piece I most wanted to see.

How it works, and why breathability matters

X-SHELTER is built on the same principle as high-performance building insulation: countless pockets of trapped air interrupt the transfer of heat. Hence "insulation you wear."

What interested me most, though, was how breathable it is. The main cause of discomfort in winter isn't really the cold itself — it's the chill that follows sweat. You move, you sweat, the sweat cools and takes your body heat with it. X-SHELTER heads that off by venting moisture out of your clothing efficiently. Rather than warming you with bulk, it keeps you comfortable by never letting the damp and the chill build in the first place. The *quality* of the warmth is different.

Alongside the α model carried over from last year, this year adds a new β model. The β stretches well and is thin and light while still holding heat; the older α is tougher and highly breathable. They're two different answers rather than an upgrade.

They also showed me a version made up as a rain jacket. It uses the 50,000-class breathable fabric Workman works with, and interestingly it mixes two-layer and three-layer construction depending on the panel — the stiffer, more durable two-layer goes where a backpack rubs, at the shoulders. It has the water resistance to wear in heavy rain, and because it's so breathable, the heat and moisture trapped inside escape rather than accumulating. At ¥9,800 for a rain jacket, that's an aggressive price.

What it felt like on

The first thing that surprised me was how thin and light it is. There's no puffed-up bulk to it, and it still holds warmth. With a hip belt cinched down, the upper body still has room to breathe and nothing restricts you.

Even wearing it in a warm hall, it didn't turn stifling, and the idea behind it — not making you notice temperature swings — came through physically. With a down jacket you walk out thinking it's cold, then get on a train and immediately start sweating; this takes the edge off that. The high neck means you don't need a scarf, and the hood packs away neatly. I caught myself saying out loud that I wanted it in black, which tells you how much I'd wear it off the mountain too.

Who it's for

• Anyone who struggles with damp and sweat chill in winter
• Anyone on low-mountain hikes with big temperature swings, or who wants one piece for commuting and walking around town as well
• Anyone who'd rather test the idea at a modest price before committing to an expensive winter shell

Merino wool — a mountain staple at a surprising price

The other standout was the merino wool. Merino is about as classic as mountain materials get, but the balance of price and quality here is unusual.

Three reasons merino earns its place

They'd set up demonstrations so you could feel the properties for yourself. Here are the three I tested with my own hands.

1. It warms as it absorbs moisture. Wool generates heat within the fibre itself as it takes up moisture — sweat or water vapour. On a thermal camera, dry wool and dry polyester read at roughly the same temperature. Expose them to humidity alone and the wool starts to warm; add water standing in for sweat and it goes red from the centre outward. The polyester stays cold. Hold them and you can feel that the wool is faintly warm. That's exactly why it's the fibre of choice next to the skin.

2. It controls odour. The obvious worry with anything that absorbs sweat is smell, and wool binds the ammonia in sweat and neutralises it. In a jar test with ammonia in it, the cotton and the polyester were sharp enough to make you flinch; only the wool had almost no smell. It works because wool fibre is a multi-layer structure covered in overlapping scales, and odour molecules get trapped inside. Wash it and the smell goes with the dirt. It also keeps working up to its capacity — they'd been running the demonstration since that morning and it was still holding.

3. It feels good against the skin. Merino is graded by how fine the fibre is. The itch people associate with wool comes mostly from fibre thickness, and finer means less of it. Typical merino runs about 20–25 microns; Workman uses a finer, higher grade. Handling it next to ordinary wool, the density and the softness are clearly different.

Why ¥1,900 is possible

All of that costs ¥1,900. When I asked how, the answer turned out to be procurement.

Fine fibre is limited by the individual sheep and the part of the fleece it comes from, so it's scarce and normally expensive. Workman keeps the cost down by buying in very large single lots, and by buying more than a year ahead, when wool prices are low. That insulates them from price swings and is what makes the shelf price possible. Hearing how the buying works, not just how the material works, made the price make sense.

How I'd use these two in autumn and winter

The key to comfortable walking on a low mountain in the colder months is preventing sweat chill, and these two fit that thinking neatly.

Put merino next to your skin as a base layer and you get warmth as it takes up moisture, plus odour control. Layer X-SHELTER over it and the combination of insulation and breathability means you're much less likely to get damp or chilled, whether you're moving or standing still. Layering with each material's job in mind changes how a day in the mountains feels. I've written about the basics of layering separately, and reading that alongside this will make it easier to picture how these two fit in.

One honest caveat: this is based on trying the pieces on at a preview and going through the demonstrations. A review from actually using them in the mountains will come in a later video. Even so, the thinking and the build quality packed into these prices are worth your attention.

What I'd conclude

What X-SHELTER and this merino have in common is very Workman: real function at a price you can reach. X-SHELTER handles sweat chill and temperature swings; the merino handles warmth, odour and comfort against the skin. Both work as a first purchase for someone starting to walk in the colder months, and both are good value as everyday clothing.

If you're wondering which to try first, start with the ¥1,900 merino. The comfort against the skin and the warmth it produces as it absorbs moisture are worth more than the price. Then, if damp and chill while you're moving are the problem, layer X-SHELTER over it.

I hope these two make your autumn and winter walking warmer and more comfortable.

Related posts

Layering for Winter on a Low Mountain | How to Dress and Pack So Sweat Never Chills You

Workman X-SHELTER Might Be the Best Summer Kit Going | Heat-Shield Pants to a 100,000 g Rain Shell, and a ¥6,900 Head-to-Toe Outfit

Kintokiyama Day Hike | The Kintoki Shrine Route, Where the Kintaro Legend Meets a Mount Fuji View

Mt. Daibosatsurei Day Hike | A Beginner-Friendly Loop from Kamihikawa Pass over the Karamatsu Ridge to Daibosatsu Pass, with the Best Mt. Fuji View I've Had

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