The flax fiber behind linen cloth — cool to the touch, stronger when wet, and famously willing to wrinkle.
Linen is woven from the fibers of the flax plant, and it is one of the oldest textiles in the world — flax cloth wrapped Egyptian mummies and dressed European households for millennia before cotton arrived. The fiber lives in the stem of the flax plant, in the bast layer under the bark, and coaxing it out cleanly takes more steps than almost any other apparel fiber, which is why good linen has always cost more than cotton.
What the buyer gets for that effort is a fiber with a personality nothing else copies: crisp at first, then softer with every wash; cool and dry against the skin in heat; stronger wet than dry; and prone to creases that wearers have learned to read as part of the cloth rather than a flaw. Summer suits, shirts, dresses and bedding are still linen territory.

Flax for fiber is pulled from the ground rather than cut, to keep the full length of the stem fibers, then retted — spread in fields for dew retting or soaked for water retting — so microbes dissolve the pectin binding the fibers to the woody stem. After drying, scutching machines beat and scrape away the broken wood, and hackling draws the fiber strands through combs that separate the long, fine line fibers from the shorter tow.
Line fiber is wet-spun into the smooth, lustrous yarns of fine linen; tow goes into coarser yarns for heavier cloth and blends. Every stage is a quality fork: under-retted flax resists separation, over-retted flax loses strength, and rough scutching chops long line into tow value. That sensitivity to weather and handling is built into linen pricing.
Flax fibers conduct heat away from the body and absorb moisture without feeling damp, so linen clothing feels cool in hot weather and linen sheets are prized in warm climates. The fiber is strong — stronger wet than dry, which is rare — and it resists dirt and lint, so well-made linen lasts for decades and improves with washing.
The same stiff, crystalline structure that makes flax strong also makes it inelastic. Linen bends sharply instead of stretching, so it creases, and it does not spring back. Designers work with that fact: relaxed summer cuts, garment washing for a softer broken-in hand, and blends with cotton or a touch of elastane where a smoother look or easier fit is needed.
Linen serves summer suits, jackets, shirts, dresses and trousers, and in the home it is the classic fiber for table linen, towels, sheets and upholstery. Because flax grows best in cool, moist regions, Western Europe has kept a leading role in quality flax growing and linen weaving. When sourcing, ask whether a fabric is woven from line or tow yarn and whether it was garment washed — those two facts predict the hand and the price better than the word linen alone.
Flax fibers are stiff and inelastic, so when linen cloth bends, the fibers hold the bend instead of springing back. The creasing is structural, and most linen clothing is cut in relaxed styles that wear the creases gracefully.
Yes. Flax is one of the few fibers that gains strength when wet, which is one reason linen towels, sheets and table linen survive decades of laundering better than most plant-fiber textiles.
Line is the long, fine flax fiber combed out in hackling, used for smooth quality linen yarn. Tow is the shorter fiber removed in the same process, used for coarser yarns, heavier cloth and blends.