Denim Jeans

Material Composition Assumptions

The default reference product is a pair of conventional denim jeans weighing approximately 0.9 kg, composed of:

• Cotton denim fabric: 98-100% cotton twill weave (3x1 right-hand twill), approximately 12-14 oz/yd² (400-475 g/m²). Raw cotton input ~1.1 kg accounting for ginning, spinning, and weaving losses.
• Indigo dye and chemicals: Synthetic indigo dye applied via rope or slasher dyeing, plus sizing agents (starch or PVA), softeners, and finishing chemicals — approximately 20-30 g chemical input per garment.
• Thread and hardware: Polyester-core cotton-wrap sewing thread, brass or zinc alloy rivets and buttons, leather or synthetic brand patch — approximately 30-50 g.
• Packaging: Polybag, cardboard hangtag, shipping carton (allocated per unit) — approximately 25 g.

Denim is substantially heavier than most garment categories, requiring more raw cotton per unit and more energy-intensive weaving on shuttle or rapier looms. The indigo dyeing process involves multiple dip-and-oxidation passes (typically 6-12 immersions), making it one of the most water- and energy-intensive dyeing methods in the textile industry.

Manufacturing Geography

The default manufacturing region is a blended global scenario: cotton grown in the USA, India, or West Africa, with spinning and weaving in India, China, or Pakistan, and garment assembly and finishing in China, Bangladesh, Turkey, or Mexico.

• Grid intensity (China): 565 gCO2e/kWh (IEA Emissions Factors 2024). China is the world’s largest denim fabric producer, with major mills concentrated in Guangdong province.
• Grid intensity (Turkey): 420 gCO2e/kWh (IEA 2024). Turkey is a major denim producer with vertically integrated mills.
• Grid intensity (Bangladesh): ~550-600 gCO2e/kWh. Major garment assembly hub.
• Grid intensity (Mexico): ~410 gCO2e/kWh (IEA 2024). Significant denim production for North American markets.
• Rationale: Denim jeans have unusually high Scope 2 intensity relative to other garments because the weaving step (heavy shuttle looms) and indigo dyeing (repeated dipping with heated indigo baths and oxidation) are both highly energy-intensive. Finishing processes like stonewashing, enzyme washing, and laser distressing add additional energy loads.

Regional Variation

Manufacturing Region	Grid Intensity	Estimated CCI Score	Adjustment vs Default
China (default)	~565 gCO2e/kWh	25.0 kgCO2e	Baseline
Turkey	~420 gCO2e/kWh	23.5 kgCO2e	-6%
Mexico	~410 gCO2e/kWh	23.4 kgCO2e	-6%
Bangladesh	~580 gCO2e/kWh	25.2 kgCO2e	+1%
EU (Italy, Spain)	~300 gCO2e/kWh	21.8 kgCO2e	-13%

Note: Scope 2 represents approximately 21% of the total footprint for denim due to the energy-intensive weaving and dyeing steps. Grid intensity changes have a moderate effect on total score. The largest emission driver remains Scope 3 upstream cotton cultivation and chemical production.

Provenance Override Guidance

A supplier or brand may override the default CCI score by submitting:

1. Environmental Product Declaration (EPD) or Product Carbon Footprint (PCF) per ISO 14067 or PAS 2050, covering cotton cultivation through finished garment.
2. Cotton sourcing data specifying origin, farming system (conventional, BCI, organic, regenerative), and irrigation method. Organic cotton can reduce cultivation emissions by 30-45%.
3. Mill-level energy data for weaving, dyeing, and finishing, including fuel mix for steam generation and any renewable energy procurement. Mills using natural gas rather than coal for steam can reduce finishing emissions by 40-50%.
4. Finishing process data: Laser finishing as an alternative to stonewashing can reduce finishing-stage emissions by 50-70%. Ozone washing reduces water and energy use compared to chlorine bleaching.
5. Higg FEM (Facility Environmental Module) verified data from Sustainable Apparel Coalition members.

Methodology Notes

• CCI score of 25 kgCO2e represents a conservative cradle-to-gate estimate. Levi Strauss & Co. (2015) reported approximately 33.4 kgCO2e for cradle-to-grave, with production accounting for roughly 20-23 kgCO2e. The higher CCI estimate reflects conservative assumptions about coal-intensive manufacturing grids and conventional cotton farming.
• Scope breakdown: Scope 3 dominates at 76% (19.0 kgCO2e), driven by cotton cultivation, chemical production, and upstream spinning at supplier facilities. Scope 2 is 21% (5.2 kgCO2e), reflecting the energy intensity of weaving and indigo dyeing. Scope 1 is 3% (0.8 kgCO2e) from on-site boilers.
• Functional unit: One pair of denim jeans (~0.9 kg), cradle to gate, including cotton cultivation, ginning, spinning, weaving, dyeing, finishing, cutting, sewing, and packaging.
• Use-phase emissions (laundering) are excluded. Consumer washing and drying of jeans can add 12-25 kgCO2e over the garment’s useful life depending on wash frequency and dryer use.
• End-of-life: Excluded. Denim has a relatively low recycling rate (~15% fiber-to-fiber recycling) due to the difficulty of separating blended fibers and removing indigo dye.
• Data gaps: Finishing processes vary enormously by brand and style. Heavily distressed jeans may require 2-3x more finishing energy than raw or rinse-wash denim. This variation is not captured in the default score.