Horsehair

Overview

Coarse mane or tail hair used for resilience and structure rather than softness.

Feel and behavior

Springy, firm and strong.

Where you find it

Upholstery, tailoring interlinings, brushes and decorative work.

Source and geography

Horsehair is the long, coarse hair of the tail and mane of the domestic horse (Equus caballus). Sources include hair from slaughtered animals and trimmings from living horses. Tail hair is longer and is preferred for weaving haircloth and for the bows of string instruments, while shorter mane and body hair has been curled for upholstery stuffing. Published data on the volume and geography of the horsehair trade are scarce in the sources reviewed, so provenance claims should be checked against supplier documentation.

Worth knowing

• John Boyd Textiles has woven horsehair fabric in Castle Cary, England, since 1837, using mechanical looms developed around 1870 that pick one hair at a time.
• In hand weaving of haircloth, a child traditionally sat in the loom to pass single hairs to the weaver.
• White tail hair tends to be shorter than black or brown hair, so white haircloth is narrower.

Types, grades and fabrics

Types and grades

Horsehair is graded by source, length and color. Tail hair is longer and is used for weaving and bows; mane and body hair is shorter and goes into curled upholstery stuffing and brushes. Weavers report white tail hair at roughly 20 inches (about 50 cm) and black or brown hair up to about 25 inches, which sets the width of woven haircloth. Bow makers prefer tail hair from stallions in cold climates such as Mongolia and Siberia, dressed repeatedly to remove kinked or thick hairs; white hair is standard for violin, viola and cello bows. Curled hair is sold by grade and hair content, and synthetic monofilament horsehair braid is a separate, non-hair product.

Fabrics and products

Haircloth is woven with a single horse tail hair as each weft pick on a cotton, silk or linen warp, so fabric widths are limited to roughly 70 cm or less. It comes in plain, satin and patterned weaves for chair seats, headboards, wall panels and luxury upholstery. Hair canvas interlinings stiffen the chests and lapels of tailored jackets. Curled mane hair fills traditional sprung upholstery and mattresses. A violin bow carries a flat ribbon of roughly 150 to 200 tail hairs, rosined to grip the string. Horsehair also appears in brushes, fishing lines, jewelry and millinery.

Buying and care

How to judge quality

Genuine haircloth has a crisp, slightly glossy surface where individual hair ends are visible at the selvedges, and a burn test on a loose weft end gives a hair smell and brittle ash rather than a melted bead. Width is a cue: horsehair fabric wider than the longest tail hairs is suspect. For bow hair, look for even, straight hairs without kinks and ask whether it is stallion hair and from which region. For upholstery, curled hair should spring back strongly when compressed; hair mixed with plant fiber or synthetic fill is cheaper. Millinery braid labeled horsehair is usually nylon or polyester.

Care in detail

Vacuum haircloth upholstery with a soft brush attachment and wipe with a barely damp cloth; avoid soaking, which can loosen hairs and stain the warp. Test any spot cleaner on a hidden area. Keep furniture out of strong sun, which fades dyed hair and dries the warp. Hair canvas in tailored jackets should be dry cleaned or professionally pressed, not washed. Bows need rosin, loosened hair after playing, and clean hands; avoid touching the hair. Store bows away from heat and humidity swings and watch for bow bugs (carpet beetle larvae) in cases. The product label governs.

Care at a glance

Follow the complete product’s care label. Blends, dyes, finishes and construction can change suitable washing, drying and storage.

Environmental and social footprint

Horsehair is a by-product: tail hair is trimmed from living horses or recovered at slaughter, depending on the supply chain, and haircloth weavers such as the long-established English mill John Boyd Textiles state that they use tail hair from live horses. Volumes are small and published environmental data are scarce, so no quantified footprint is available. Processing uses washing, degreasing, sometimes bleaching, and dyeing. Welfare questions concern trimming practices and slaughter conditions in supplying countries, which buyers can only check through supplier information. Curled hair stuffing is durable and can be reclaimed and re-curled by upholsterers, extending product life compared with foam.

Tradeoffs

Origin, processing inputs, labor, product construction and useful lifetime all need specific evidence. The name alone does not establish responsible production.

A useful question to ask: What exact material, product form and documented producer stand behind this name?

Science

Protein-based natural material

Most hair is keratin; silk is a different protein-fiber system.

Structure and chemistry

Horsehair is alpha-keratin, like other mammalian hair, but its fibers are thick, stiff and long enough to be handled as individual strands, closer to a natural monofilament than to a staple fiber. Each hair has a cuticle of flattened scales over a thick cortex, with a medulla that may be continuous or fragmented. Its textile value lies in stiffness and elastic recovery. Mi, Shao and Vollrath (2019) demonstrated how keratin-rich it is by bundling horse tail hairs in a regenerated silk matrix to make composites whose FTIR, DSC and thermogravimetric behavior resembled rhinoceros horn, itself a keratin structure.

From source to yarn

Raw hair is sorted by length, color and source (tail or mane), washed and degreased, and combed or hackled to align strands and remove short hairs. For haircloth, single tail hairs are inserted as weft into a warp of cotton, linen or silk, so that fabric width is limited by hair length. For upholstery, shorter hair has traditionally been twisted into tight ropes, set with heat and moisture to give a lasting curl, then teased apart into a springy filling. For string-instrument bows, selected tail hairs are bundled into a flat ribbon and rosined in use.

Performance in use

Horsehair is used for resilience rather than warmth. Its stiffness and recovery let haircloth interlinings hold the shape of tailored chests and lapels, and curled hair fillings spring back after compression and allow airflow. It is strong and durable, absorbs some moisture like other keratins, and burns slowly with a hair odor rather than melting. Natural black, grey and white hairs are used, and it can be dyed with protein-fiber dye classes. It is vulnerable to moths and carpet beetles, especially in old upholstery, and aged, brittle hair can break and poke through covering fabrics.

How it is identified

Burn testing (indicative only; perform with care) separates real horsehair from the nylon or polyester monofilament often sold as horsehair braid: keratin chars with a burning-hair odor and brittle ash, while these synthetics melt into hard beads. Under the microscope, genuine horsehair shows a scaled cuticle and a variable medulla, whereas synthetic monofilament is smooth and uniform. FTIR, which Mi and colleagues used to characterize horse hair keratin, separates keratin from polyester readily; separating it from nylon, which also has amide bonds, relies on additional spectral features and microscopy.

History

Timeline

1. 1837John Boyd Textiles began weaving horsehair fabric in Castle Cary, England. [1]
2. c. 1870Mechanical looms that pick one hair at a time were developed for horsehair weaving. [1]
3. 2011Regulation (EU) No 1007/2011 listed horsehair among the Annex I textile fiber names. [2]

Horsehair cloth supported tailoring and millinery, while shorter curled hair filled furniture. Many modern products named horsehair braid are actually synthetic.

The deeper record

Haircloth woven with a horsehair weft served for durable upholstery and as a stiffening interlining in tailoring and millinery, valued for a springy recovery that few materials matched. Curled horsehair was a standard high-grade upholstery stuffing before foams and synthetic fibers became common fillings in the twentieth century. Tail hair also has a long history in the bows of string instruments and in brushes. As the atlas entry notes, many modern millinery braids called horsehair are synthetic, and a 2019 study showed horse tail hair being used experimentally as a substitute material for rhinoceros horn.

Labeling and law

Annex I of Regulation (EU) No 1007/2011 groups horsehair in the category animal or horsehair, with or without an indication of the kind of animal, separate from the named fine hairs such as camel or alpaca. In the United States horsehair is not among the specialty fibers of the Wool Products Labeling Act, and disclosure of hair from other animals follows the FTC rules at 16 CFR 303.6, including the collective term fur fiber where no claim about the animal is made. Products marketed as horsehair that are actually synthetic must carry the generic synthetic fiber name.

This describes what rules and standards cover. It is not legal advice; jurisdiction, product form and current rule text control.

Frequently asked

Is horsehair braid in hats real horsehair?

Usually not. Most millinery braid sold as horsehair is nylon or polyester monofilament. A burn test on a single strand separates them: synthetic melts to a hard bead, while real hair chars with a burning-hair smell.

Why are violin bows strung with horsehair?

Horse tail hair has a scaled surface that holds rosin, which makes the hair grip and release the string to set it vibrating. A bow uses roughly 150 to 200 hairs, and bow makers favor stallion hair from cold climates for strength.

How often should a bow be rehaired?

String shops commonly advise about every 6 to 12 months for regular players and more often for daily professional use. Signs include lost hairs, poor grip even after rosining, and uneven hair tension.

Why is horsehair fabric so narrow?

Each weft pick is a single tail hair, so the cloth can be no wider than the usable length of the hair, roughly 70 cm or less. Wider fabrics labeled horsehair usually contain other fibers.

Sources

• Museum of Fine Arts, Boston: Horsehair
• legislation.gov.uk: Regulation (EU) No 1007/2011, Annex I
• Scientific Reports: Creating artificial rhino horns from horse hair (Mi, Shao and Vollrath, 2019)
• eCFR: 16 CFR 303.6, Generic names of fibers to be used
• Sunny Bank Mills: Everything you didn't know about horse hair weaving
• Johnson String Instrument: Violin bow, cello bow, how are they made?
• CPR Classical: 10 facts about the horsehair on a string player's bow

Cite this page

Chaos. (2026). Horsehair. In Fibers of Earth: An independent textile atlas. https://www.hendrickresearch.com/fibers/materials/horsehair/