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Why Slubby Heavyweight Denim Like This Is Easier to Wear Than You Might Think
When you first get into raw denim, you probably start with something like a classic 14 oz. redline selvedge. From there, you might go heavier or start looking for something with more texture—something like HIROSHI KATO’s Monster Slub.
Before I wore my first pair of slubby jeans, I expected them to be rough and uncomfortable. Turned out to be the opposite. Slubby denim drapes differently, and as it softens, it becomes surprisingly comfortable—almost like sweatpants.
The real difference is how it looks. Those vertical streaks—known as tate-ochi—give it a much more distinct, uneven appearance, which isn’t for everyone. But if that is what you’re after, I’ll show you why KATO’s Monster Slub is worth a closer look.
What This ‘Monster Slub’ Denim Actually Is
Unlike what KATO is best known for, this isn’t a 4-way stretch denim. It’s a 17 oz. Japanese selvedge made from 100% cotton, rinsed or washed, which takes the edge off the initial stiffness. It’s still a substantial fabric, make no mistake.
It’s woven from ring-spun yarn, which naturally creates slight irregularities—known as slubs—that show up as subtle texture in the fabric.
What sets KATO’s Monster Slub apart is how far this is pushed. Alongside those natural irregularities, there’s deliberate variation in yarn count in the warp. Some yarns are thicker, others finer, and that contrast creates the uneven surface.
That unevenness defines how the denim looks and evolves. You see the texture immediately. As the indigo wears off, the more exposed parts of the yarn fade faster than the less exposed areas, which results in lots of depth and variation with wear and wash.
What the Monster Slub Denim Wears Like
I’ve worn a similar heavy, super slubby denim for a full year during the Indigo Invitational. It behaves quite differently from standard selvedge—and you notice that straight away.
From the start, it doesn’t feel stiff in the way you might expect. The fabric moves a bit more and drapes differently, despite the weight. The texture is obvious, but it doesn’t make it harder to wear—if anything, it becomes easier.
Fading follows the same pattern. Creases are softer and less defined, and it’s less about sharp contrast and more about how the surface develops over time.
You don’t get clean, high-contrast lines—instead, the character comes from the texture and how it evolves with wear.
The Monster Slub Line-Up
KATO’s Monster Slub takes the texture and character you find in vintage denim and pushes it further. The result is a fabric that’s deliberately more uneven and visually distinctive.
It’s available in some of KATO’s core styles:
The Hammer (Jeans)
A medium-rise, straight fit with a slight taper. This one comes in a rinse, so you’re starting pretty close to raw. The rinse takes the edge off the break-in, and let’s you fade it.
These are the jeans to get if you want to see how this fabric develops from stratch. You get the texture from the start, and the fades will be your own.
The Barrel (Jeans)
A classic straight fit in a pre-washed version. It’s not “brand new raw”—you’re getting something that’s been pushed towards a worn-in look, with the texture already showing.
It gives you a sense of where this denim is headed. You won’t get the full break-in process, but you do get the character straight away.
The Anvil (Jacket)
A hybrid between a shirt and a jacket, cut using a 3D pattern that adds shape through the body. That gives it more structure and a closer fit.
With the Anvil, you can bring the Monster Slub into your wardrobe without it being the main piece. Just layer it over a T-shirt or a shirt.
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