Cotton Hoodie / Sweatshirt

Product Profile

A cotton hoodie or sweatshirt is one of the highest-volume garment categories globally: a 300–600g knit fleece top with a kangaroo pocket and hood, sold across all price points from fast fashion to premium basics. The reference product is a mid-weight French terry or fleece hoodie (~500g finished weight) in conventional cotton, dyed and finished in a wet-process facility.

At 15 kgCO2e per unit, a cotton hoodie carries roughly 3× the footprint of a cotton t-shirt on an absolute basis — and the wet finishing process is the single largest hotspot, ahead of even cotton farming itself.

Why the Score Is What It Is

Hoodies are deceptively carbon-intensive because they combine multiple high-impact processes:

• Dyeing and finishing leads the hotspot list at 28%. A hoodie’s fleece fabric must be scoured, dyed (often reactive or vat dyes requiring high-temperature baths), and mechanically finished (brushing, napping). Wet processing facilities in Bangladesh and Vietnam typically use natural gas or heavy fuel oil boilers; upgrading to steam from renewable electricity is the industry’s biggest decarbonization opportunity.
• Cotton farming is land- and chemical-intensive. Conventional cotton is one of the most pesticide-intensive crops globally. Nitrogen fertilizer application emits N2O, a greenhouse gas approximately 265× more potent than CO2 over 100 years. A 500g hoodie requires roughly 750g of raw cotton fiber (accounting for ginning and spinning losses).
• Fleece brushing adds a step that plain jersey skips. The mechanical brushing process that creates the soft internal nap of fleece fabric adds both direct energy and mechanical wear, contributing ~10% of total emissions — a cost unique to this garment category versus t-shirts or woven shirts.
• Heavier weight means more of everything. At ~500g, a hoodie contains roughly 3× the cotton of a t-shirt. Spinning, knitting, dyeing, and sewing time all scale roughly with fabric mass.

Scope Breakdown Detail

Scope	kgCO2e	% of Total	Key Drivers
Scope 1	1.0	7%	Dyehouse fuel combustion, finishing chemicals
Scope 2	2.5	17%	Electricity for knitting, dyeing, assembly
Scope 3	11.5	77%	Cotton fiber, yarn, chemicals, packaging, logistics
Total	15	100%

Comparison Points

Product	Approx. kgCO2e	Notes
Cotton t-shirt (~200g)	5	Reference sibling product
Cotton hoodie (~500g)	15	Reference product
Denim jeans (~800g)	30–35	Indigo dyeing and sandblasting add to wet process burden
Organic cotton hoodie (~500g)	12–13	Reduced pesticides and synthetic N; some grid electricity reduction
Recycled cotton blend hoodie	10–11	Mechanical recycling avoids most upstream fiber emissions
Polyester fleece hoodie (~500g)	10–12	Lower per-kg footprint but microplastic shedding concern

The organic premium narrows but does not eliminate the footprint — wet finishing energy remains similar regardless of fiber certification.

Provenance Override Guidance

Brands or factories with verified Environmental Product Declarations or third-party audited carbon footprints may submit provenance overrides. Key data points:

• Fiber certification and origin — organic, recycled, or BCI cotton affects upstream farming emissions
• Dyehouse energy source — natural gas vs. biomass boiler vs. electric; a renewable-powered dyehouse can cut the dyeing hotspot by 60–80%
• Factory location and grid intensity — Bangladesh and Vietnam carry higher grid intensity than Portugal or Turkey
• Garment weight — actual finished weight in grams; the default 500g assumption drives the per-unit score