Cotton

What is cotton?

Cotton is a natural cellulose fiber that grows in a boll around the seeds of plants of the genus Gossypium. It is the most widely used natural fiber in textile production worldwide — the raw-material benchmark against which practically every other fiber, natural or synthetic, is compared on cost and performance.

How does cotton behave as a fiber?

Raw cotton fiber is composed of roughly 90% cellulose, which explains its high capacity to absorb moisture and readily take dye. One structural trait, barely visible to the naked eye, is decisive for spinning: cotton fibers are hollow and twist naturally as they dry, a phenomenon called convolution, which helps yarns bind together when twisted into thread. It's this property that makes cotton relatively easy to spin without additives.

Finishing also transforms the fiber's behavior. Mercerization — an alkaline treatment developed by John Mercer in 1844 — swells the fiber, increasing its luster and its affinity for dye, and is now standard for higher-quality cotton fabrics. In construction, cotton is the base of structures as different as jersey knit, twill, and denim — the latter a cotton twill that is, in turn, the fabric of jeans.

Why does cotton matter?

By volume and cost, cotton is the raw-material benchmark in fashion: it's the yardstick against which the performance and price positioning of fibers like wool and linen are measured. Understanding its botanical origin and its properties — absorption, dyeability, spinning behavior — is a starting point for correctly reading a tech pack and for composing a collection with awareness of cost, drape and durability. At uMode, fiber composition feeds directly into tech-pack parameters that affect everything from raw-material consumption to a garment's expected behavior in washing and wear.