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organic cotton vs wool

How organic cotton and wool compare on protein, climate impact, water use, land use, saturated fat and fibre — with a clear verdict.

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The numbers

The numbersorganic cottonwool
Protein (g / 100 g)00
Climate impact (kg CO₂e / kg)5.921
Water use (L / kg)1000017000
Land use (m² / kg)3280
Saturated fat (g / 100 g)00
Fibre (g / 100 g)00

The verdict

organic cotton is the better everyday choice. It uses less land and water and carries a smaller carbon footprint than wool, while covering the same role on the plate. If protein density is your priority, adjust portion size rather than going back to wool.

Sources: Poore & Nemecek (Science, 2018), FAO, USDA FoodData Central, Mekonnen & Hoekstra (2011).

In depth

The longer answer

Cotton and wool are two natural fibers often compared by consumers choosing between clothing, bedding, or yarn crafts. Cotton comes from the fluffy bolls of the cotton plant, while wool is sheared from sheep and other animals like goats or alpacas. People compare them to decide which is more comfortable, durable, or sustainable for their needs, especially when considering breathability, warmth, and environmental impact.

Nutritionally, neither is eaten, but their production footprints differ sharply. Cotton farming typically requires heavy irrigation, pesticides, and land, contributing to water scarcity and chemical runoff. Wool production involves grazing sheep, which emits methane and can cause overgrazing and soil degradation. However, wool is more durable and biodegradable, lasting years longer than cotton, which often degrades faster and sheds microplastics if blended with synthetics.

In real life, the choice depends on use and values. For warm-weather garments or lightweight bedding, cotton is breathable and easy to wash. Wool excels in cold climates, insulating even when wet, and resists odors, making it ideal for activewear or outerwear. For lower environmental impact, choose organic cotton or responsibly sourced wool, but prioritize longevity: a wool sweater worn for a decade beats five cotton tees discarded yearly.

At a glance

Quick facts

Quick factsorganic cotton vs wool
DetailWhat to know
Fiber sourceCotton from plant; wool from sheep
Water useCotton is very water-intensive
BiodegradabilityBoth are biodegradable
DurabilityWool lasts longer than cotton

In practice

What this means for you

  • Choose organic cotton for hot-weather basics like t-shirts or bed sheets.
  • Opt for wool sweaters or socks in winter for warmth without bulk.
  • Wash wool less often and air dry to extend its life and save energy.
  • Avoid cotton-polyester blends if you want full biodegradability.

FAQ

Common questions

Which is better for the environment, cotton or wool?
Neither is perfect. Conventional cotton uses huge amounts of water and pesticides, while wool generates methane from sheep and can cause land degradation. Organic cotton and regenerative wool farming reduce harm. The most eco-friendly choice is often the one you keep longest, so durability matters.
Is cotton or wool more breathable?
Cotton is generally more breathable, allowing air to circulate and moisture to evaporate quickly, making it ideal for warm weather. Wool can also breathe but is better at trapping heat, so it's less suited for hot climates unless it's a lightweight merino wool.
Can wool be worn by people with sensitive skin?
Some people find traditional wool itchy due to coarse fibers, but merino wool is much softer and often tolerated. Cotton is hypoallergenic and rarely irritates, making it a safer choice for sensitive skin. Always check labels for blends that might add synthetic irritants.

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