Wool, Linen, Nylon and Elastane: The Rest of the Fiber Family

Why learn the supporting fibers

The first lesson of this module sorted every fiber into natural, regenerated cellulose and synthetic. See what is a fiber. Most institutional fabric is built from three of them: cotton, polyester and viscose. The four fibers in this lesson appear less often. When they do, they usually explain something a buyer notices straight away: the springy handle of a premium suit, the cool dryness of a summer jacket, the toughness of a work trouser, or the give in a stretch scrub.

Knowing them helps you read a composition line properly. A fabric listed as 96 percent polyester and 4 percent elastane behaves very differently from plain polyester, even though the second fiber is only a small share.

Wool: the classic suiting fiber

Wool is the fleece of sheep, a natural protein fiber made of keratin, the same family of protein as human hair. Each wool fiber has a natural wave called crimp and a scaly surface. The crimp makes wool springy and resilient, so it recovers from creases and holds a pressed shape well. It also traps air, which is why wool is warm. Wool can absorb a good deal of moisture vapour before it feels wet, so it stays comfortable across a wider range of conditions than most fibers.

The scales have a downside. With heat, moisture and rubbing, they lock together and the cloth felts (mats) and shrinks. This is why pure wool usually needs dry cleaning or careful washing. Wool is spun two ways. Worsted yarn is combed so the fibers lie parallel, which gives smooth, fine suiting. Woollen yarn keeps the fibers jumbled, for a softer, fuzzier cloth. Both are defined in the fabric type glossary.

In uniforms, wool and wool blends show up in premium business suits, blazers, ceremonial and winter dress uniforms. Most institutional suiting instead uses polyester or poly-viscose, which gives a similar tailored look with easier care, as covered in formal attire suiting fabric.

Linen: cool, crisp and quick to crease

Linen is made from flax. Unlike cotton, which grows on the seed, flax fiber comes from the stem of the plant, so it is called a bast fiber. The stems are retted (partly rotted, traditionally by moisture and microbes) to loosen the fiber bundles. Then the fiber is separated, combed and spun. Like cotton, linen is cellulose, so it absorbs moisture well and feels cool. It is a strong fiber and is stronger when wet than when dry.

Linen has very little stretch or springiness, so it creases easily and holds the crease. That relaxed look is part of its appeal in summer wear, but it is a problem for uniforms that must look sharp at the end of a shift. Linen therefore appears in summer jackets and shirts, resort and hospitality wear, often blended with cotton or polyester to reduce creasing.

One point to watch: in hospitals and hotels, linen also means sheets and towels, whatever they are made of. Hospital linen is usually cotton or poly-cotton, not flax, as explained in hospital linen: polyester versus cotton.

Nylon: the strong synthetic

Nylon is a synthetic fiber from the polyamide family, made from petrochemical building blocks and melt spun through a spinneret, much like polyester. It is very strong and light, and has excellent abrasion resistance, meaning it survives rubbing and scuffing well. It also has more natural stretch and recovery than polyester.

In apparel, nylon is common in outerwear, linings, sportswear and hosiery. In workwear it is sometimes blended in small amounts to reinforce cloth that takes heavy wear at knees, seats and pockets. See industrial workwear fabric. For most woven uniform shirting and suiting, polyester does the strength job at lower cost and with easier dyeing. So nylon stays a specialist choice.

Elastane: the stretch fiber

Elastane is a synthetic fiber based on polyurethane that can be stretched to several times its length and spring back. In North America it is called spandex. Lycra is a well-known brand name for it, which is why stretch fabric is often called lycra fabric in the trade.

Elastane is almost never used alone. A small share, usually a few percent, is combined with polyester, viscose or cotton. Often the elastane is wrapped inside the other fiber (core-spinning) so it does not show on the surface. That small share is enough to give stretch trousers, fitted shirts, scrubs and sportswear their comfort and freedom of movement. Stretch direction (two-way or four-way), recovery and care are covered in stretch and lycra uniform fabric, including why elastane dislikes high heat and chlorine.

Side by side

Reading these fibers on a spec sheet

• The composition line is listed by weight, largest share first, for example 65/32/3 polyester viscose elastane.
• A small elastane share changes fit and care far more than its percentage suggests; check the care label for wash and iron temperature.
• A wool-like or linen-look finish is not the same as the fiber. Check the composition, not the name of the quality.
• Ask what the second fiber is doing: comfort, stretch, warmth or wear resistance. If you cannot name the job, the blend may be more expensive than it needs to be.

Terms from this lesson, including worsted, woollen, elastane and lycra, are in the glossary. Next lesson: what moves fiber prices, and why each fiber follows its own raw material.

FAQ

Frequently asked questions

Is lycra the same as elastane or spandex?

Yes, as a fiber type. Elastane is the generic name, spandex is the name used in North America, and Lycra is a brand name that the trade often uses loosely for any stretch fabric.

How much elastane does a stretch uniform fabric need?

Woven uniform fabrics usually carry a small share, a few percent, which is enough for comfortable give. More is not automatically better: higher shares change the handle and care needs. The stretch and lycra guide covers how to choose.

Why are most uniform suitings not pure wool?

Pure wool is comfortable and tailors beautifully, but it needs careful washing or dry cleaning and costs more. Polyester and poly-viscose suiting give a similar tailored look with machine-washable easy care, which suits institutional programmes.

Is linen good for hot-climate uniforms?

Linen is cool and absorbent, but it creases readily, so it suits relaxed summer wear more than uniforms that must stay sharp. Breathable poly-viscose or cotton-rich blends are the more common choice for hot, humid climates.

Does nylon make workwear stronger?

Nylon is very strong and resists abrasion well, so blending some into workwear cloth can improve wear at high-stress areas. For most woven uniforms, polyester blends already give enough strength with easier dyeing.