We have all seen the statistics. The defining one, perhaps, is that a single new pair of conventional jeans requires roughly 7,500 liters of water to produce—from the thirsty cotton field to the toxic indigo dye bath. It is a reality that weighs heavily on any conscious consumer.
But what if we could bypass that entire destructive lifecycle? What if the "new" pair of jeans was already hanging in your closet, just in a different form?
This is the promise of circular denim: turning yesterday’s waste into tomorrow’s wardrobe staple. But as with everything in sustainability, the devil is in the details. Circularity is not just a concept; it is a rigorous technical process. At capsule, we are committed to looking past the "recycled" label to understand the how and the who behind the fabric.
Let’s take a look under the hood of two true pioneers—Dedicated. and Rifò—and explore the fascinating (and sometimes frustrating) science of truly recycled jeans.
The Anatomy of Recycling: Why Sorting Matters (and Elastane Hurts)
Before we can recycle a pair of jeans, we have to prepare them. This is the first, crucial bottleneck.
To be recycled mechanically (the most common method), denim must be sorted by color and, more critically, by composition. This is where sorting becomes incredibly difficult. A modern pairs of "denim" is rarely 100% cotton. It’s usually a complex blend of cotton, polyester (for strength), and elastane (lycra) for stretch.
1. Sorting the Threads
A professional sorter must identify and separate the "pure" cotton denim from the "stretch" blends. Why? Because you cannot easily separate the microscopic elastane fibers from the cotton once they are woven together.
2. The Elastane Problem
Elastane (spandex) is a disruptor. During the mechanical recycling process (shredding), elastane does not break down cleanly. It turns into a rubbery, sticky mass that gunks up the machines and weakens the new yarn. This is why you often see recycled cotton content capped at around 20-30% in conventional brands; any higher, and the quality plummets because of contamination from synthetic binders. This is precisely why 100% recycled jeans are a technical breakthrough—they require a pure, 100% cotton "mono-material" input.
3. Trims, Zippers, and Rivets
Don’t forget the details. Before shredding, every rivet, zipper, button, and even the synthetic sewing thread must be manually removed. It is a labor-intensive, costly process. True circular design solves this before production, using screw-off buttons and alternative techniques that make disassembly easy.
Method 1: The Mechanical "Shred" (The Rifò Approach)
Once sorted and "de-trimmed," the clean, sorted denim fabric is fed into massive machines with rotary blades that tear it apart. It is less "recycling" and more "shredding".
The Process:
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Mechanical Shredding: The fabric is cut into small pieces and then carded until it becomes a fluffy, fibrous mass of cotton fibers.
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Shortened Fibers: This is the critical tradeoff. Mechanical shredding physically breaks and shortens the cotton fibers. The original long-staple cotton is now "short-staple."
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Spinning New Yarn: These shorter fibers are weaker. To make them strong enough to be woven back into a durable jean, they must be spun with a high "twist" or, more commonly, blended with a stronger fiber (like virigin organic cotton, hemp, or Tencel).
This is the technique that Rifò uses masterfully in their recycled cotton collections (though usually with their knit materials, not yet their full denim). The result is a soft, textured material with a unique hand-feel, but one that relies on careful engineering to maintain its durability.
Method 2: The Regenerated Fiber (The Dedicated. Approach)
For their "Dedicated. to Recycle" line, the Swedish brand often uses a slightly different, more advanced approach that can combine both physical processing and chemical regeneration.
The Process (General Principles of Regeneration):
When a brand like Dedicated refers to "recycled cotton" from pre- or post-consumer waste, they are tapping into a system where the textile waste is first shredded (like the mechanical process), but then, in some cases, the fibers can be dissolved at a molecular level into a pulp. This pulp is then extruded into new, virgin-quality cellulose fibers (like a lycra-type fiber).
The benefit is that this regenerates the fiber's original length and strength. Unlike mechanical shredding, a regenerated fiber is just as strong, if not stronger, than the original virgin cotton. This allows brands like Dedicated to create 100% recycled denim that feels, looks, and wears exactly like your favorite premium vintage pair, but with a drastically lower ecological footprint.
The "Why": Water, Indigo and Durability
So, after all this effort, what problem are we solving?
1. Radical Water Savings
The primary victory of 100% recycled jeans is water. We eliminate the entire cotton-growing phase, which accounts for the vast majority of denim's 7,500-liter water bill. We are reuseing the water already stored in the existing cotton fibers. For 100% recycled jeans, water savings can be as high as 95%.
2. The Indigo Issue
Why are jeans blue? Historically, it was for durability. The indigo dye, derived from a plant, did not penetrate the whole thread but "sat" on the outside, creating the signature fade while adding a protective layer that allowed the fabric to take a beating without falling apart.
Today, natural indigo has been replaced by synthetic (petroleum-based) indigo and a host of heavy-metal mordants to fix the color. The "dying and finishing" phase is a major source of water pollution and toxicity. Recycling allows us to bypass the dyeing process entirely. By sorting by color, we can "pre-dye" the yarn. Blue jeans are shredded into blue fiber, and then respun into blue yarn. The only color added is what was already there, drastically reducing chemical and toxic load.
3. How Durable are They?
As we’ve discussed, mechanically recycled jeans have shorter fibers and can be slightly less durable if not blended correctly. However, a well-engineered blend (like 20% mechanically recycled cotton + 80% virgin organic cotton) or a 100% chemically regenerated fiber is indistinguishable in durability from a standard pair. With a mono-material (100% cotton) input, you are not losing structural integrity.
4. Can We Recycle Them Again?
Yes. And no.
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Yes: If the jeans are a "mono-material" (100% cotton), they can enter the mechanical shredding process again.
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No (The Limit): Mechanical recycling has a limit. With each cycle, the cotton fibers get shorter and weaker. While we can technically recycle a pair of 100% cotton jeans several times (some estimates say 4-6 cycles), the quality will eventually degrade to the point where they are only useful as insulation or technical filler. This is why the goal is "regeneration" (Method 2), which could, in theory, close the loop infinitely.
The capsule View
For us, the choice is clear. True circular denim, exemplified by pioneers like Dedicated., is the answer to the "less but better" challenge. They reduce water, eliminate new dyes, and solve the durability issue by committing to pure materials and advanced regeneration technology.
A 100% recycled jean is not just a purchase; it is an active participation in closing the loop on a system that has been broken for far too long. This is systemic style.
Sources: Ellen MacArthur Foundation, UN Environment Programme, and technical data from Dedicated. and Rifò Lab.
Photos credit: Capsule, Rifò Lab, Dedicated.
