Denim is a twill-weave cotton fabric defined as much by how it's dyed and finished as by the weave itself. Two jeans at the same weight can wear, fade and age completely differently depending on decisions made long before cutting — the dye method, the loom, and the wash. Getting these right is what separates denim that develops character over years from denim that just looks tired after a few washes.
Weight — measured in ounces per square yard
| Weight range | Feel | Best for |
|---|---|---|
| Under 11oz | Lightweight, soft, less structure | Summer-weight jeans, denim shirting, skirts |
| 11–13oz | Mid-weight, balances structure and comfort | Everyday jeans, denim jackets |
| 14–16oz+ | Heavy, rugged, holds sharp creases | Raw/selvedge denim, workwear-style jeans |
Below roughly 11oz, denim tends to lose structural body during repeated washing — fine for a deliberately soft, casual product, but a real risk if the brief calls for a jean that holds its shape. Heavier weights carry more indigo through the yarn, which is exactly why they produce more dramatic, higher-contrast fades over time.
Selvedge vs regular denim
Selvedge denim is woven on narrower, vintage-style shuttle looms that produce a tightly finished, self-edge that won't unravel — a visibly denser, more substantial fabric than wide-loom denim at the same nominal weight, and priced accordingly. Regular (wide-loom) denim is woven faster on modern looms, at lower cost, and is the standard choice for most commercial private-label runs where the selvedge detail isn't part of the product story.
How indigo dyeing actually works
Warp yarns are dyed with a reduced indigo solution — typically built up through multiple passes ("dips") rather than one saturating soak, since indigo bonds to cotton in thin surface layers rather than penetrating fully through the fibre. This is exactly why denim fades: the outer layers of indigo wear away with abrasion and washing, exposing the undyed core of the yarn beneath. Mills use rope-dyeing (yarn bundled into ropes, dipped and oxidised in stages) or slasher-dyeing (yarn run flat through dye baths) — rope-dyeing generally produces a more complex, higher-contrast fade because dye penetration varies slightly across the bundled yarn, while slasher-dyeing gives a flatter, more uniform result better suited to consistent commercial colour matching.
“A jean doesn't fade because indigo washes out evenly — it fades because indigo was never fully inside the yarn to begin with. Understanding that is the difference between briefing a wash effect and just hoping for one.”
Common wash finishes
| Wash | Effect | Notes |
|---|---|---|
| Raw / unwashed | Deep, stiff, no fading yet — develops entirely through wear | Lowest processing cost; the fade becomes the customer's own |
| Stone wash | Softened hand, light overall fading, subtle texture | Standard commercial wash for everyday denim |
| Enzyme wash | Softer, more even fade than stone wash, less mechanical wear on fabric | Common where fabric longevity matters alongside softness |
| Acid wash | High-contrast, mottled fading pattern | A specific aesthetic, not a default — brief it explicitly |
| Laser fading | Precisely placed fade patterns without abrasive blasting | The modern, more worker-safe replacement for manual sandblasting |
One note on compliance: sandblasting — manually blasting sand at fabric to create a distressed, faded look — has been phased out across responsible manufacturing due to serious respiratory health risks (silicosis) for workers performing it. Laser fading achieves a comparable distressed effect without that risk, and it's worth explicitly confirming with any factory which method they use rather than assuming.
Frequently asked questions
- What denim weight is best for jeans?
- 11–13oz suits most everyday jeans, balancing structure with comfort. Below 11oz trades structure for softness; 14oz and above is the range for raw/selvedge denim and workwear-style jeans that hold sharp creases.
- What is the difference between selvedge and regular denim?
- Selvedge denim is woven on narrower vintage-style looms, producing a tightly finished self-edge and a denser fabric at the same weight — priced higher accordingly. Regular wide-loom denim is faster and cheaper to produce and is the standard for most commercial private-label runs.
- Why does denim fade unevenly?
- Indigo dye sits in thin layers on the outside of the yarn rather than penetrating fully through it. Abrasion and washing wear away those outer layers first, exposing the undyed core beneath — which is why high-contact areas like knees and thighs fade faster and more visibly than the rest of the garment.
- Is sandblasting still used for distressed denim?
- Responsible manufacturers have moved away from manual sandblasting due to serious respiratory health risks for workers, replacing it with laser fading, which achieves a comparable distressed look without that risk. Ask any factory directly which method they use.
Sources
We manufacture denim across standard and heavyweight qualities, with stone, enzyme and laser-fade finishing. If your spec sheet mixes GSM and ounces, our sister company Collective Studio's free converter tool will save you the mental math. Send your reference and target weight and we'll return costing and lead-time the same day.
Free tools for clothing brands
MOQ, pricing and AQL calculators, a GSM ⇄ oz converter, a fillable tech pack template and a manufacturing glossary — built by our sister company, Collective Studio, free to use.