Indigotex has made denim from wool that keeps you warm and skips the water

Denim is cotton, and cotton is thirsty.

Dyeing a pair of jeans indigo conventionally takes many washes and a great deal of water, and the industry's water use is among the reasons textiles draw environmental scrutiny.

Synthetic alternatives solve the water problem and create another, shedding microplastics with every wash.

There is also a seasonal limit.

Denim is not a warm fabric, which is why the world's most universal garment is largely a fair-weather one, and why cold-country wardrobes fall back on wool.