Broadwoven Fabric Mills (U.S., NAICS 31321): An Investor's Primer

This is a short rollup page. NAICS 31321 is a single-child industry — see NAICS 313210 for the full primer.

1. Overview

Broadwoven fabric mills are the factories that weave wide cloth — denim, shirting, upholstery and mattress fabric, and a growing range of technical and protective textiles for cars, filters, medical use, and the military. "Broadwoven" means woven wider than 12 inches, as distinct from narrow tapes and ribbons.[1] (NAICS = North American Industry Classification System, the U.S. government's official industry taxonomy.)

For an investor, this is a small, mature, capital-intensive U.S. manufacturing industry that has shrunk for 30 years under import pressure — but whose survivors have moved up-market, and where 2025 trade policy (the closing of the "de minimis" import loophole, higher tariffs, and forced-labor import bans) has become a genuine demand tailwind for domestic cloth for the first time in a generation.[1]

2. What's inside — and why this level equals its one child

NAICS 31321 is a five-digit "NAICS industry" with exactly one child at the six-digit level:

Because 31321 has a single child, this level is a pure pass-through: its definition, boundaries, and every federal statistic are the same as 313210's. There is nothing in 31321 that is not in 313210, and vice versa. The full detail — scope and exclusions, the investable universe, economics, demand drivers, regulation, and risks — lives in the 313210 primer. This page gives you the rollup figures for this level and points you there.[1]

3. Size (this level's rollup figures)

Federal statistics for NAICS 31321 (our ground-truth figures; identical to the child because there is only one child):

This is a tiny industry relative to the U.S. economy — roughly $3.6 billion of output, about 13,000–18,000 workers (depending on survey methodology), and fewer than 240 plants nationwide.[2][3][4] The employment range reflects different survey methodologies: Census County Business Patterns (establishment-based) reports 13,276 for 2023, while BLS industry employment data shows 18,412 for 2024.[2][3] Average pay is around $48,000 per worker, and the average mill runs about 57 employees — these are real factories, not garage operations.[2]

The scale of the contraction is historic. BLS data show employment fell 84.8% from 120,867 jobs in 2000 to 18,412 in 2024 — one of the largest employment contractions of any detailed U.S. manufacturing industry over that period.[3] The 2002 Economic Census reported 758 establishments, 80,530 employees, and $11.4 billion of shipments; by 2022 that had shrunk to 228 firms and $3.6 billion of shipments.[4][5] The surviving industry is a third of its size two decades ago.

Undercount caveat (runs opposite to most industries). These are permitted, taxed factories, so the Census captures the sector well — there is no large informal or individually owned segment hiding from the data. If anything, the $3.63 billion figure understates how much cloth the U.S. actually weaves, because it counts only establishments whose primary activity is broadwoven weaving. Large diversified and vertically integrated firms — Milliken, Glen Raven, Elevate Textiles — weave as one step inside plants the Census may classify under the company's primary product (performance textiles, chemicals, apparel), so some domestic weaving is booked under adjacent codes.[1] For context, the broader U.S. textile-mill workforce was roughly 89,000 in 2024, and the entire textile-and-apparel supply chain (fiber to finished product) employed about 453,000 people with $60.9 billion of shipments in 2025 — 313210 is one narrow slice of that.[6] (The U.S. Small Business Administration sets the "small business" line for this industry at 1,000 employees — a high threshold that reflects how capital- and labor-heavy a weaving plant is.)[7]

4. Investable universe (where value concentrates)

Because 31321 is one child, value concentrates exactly as it does in 313210. The short version:

• Public options are scarce and none is a large, pure U.S. apparel weaver. The realistic listed set is a micro-cap woven-fabric maker (Culp, NYSE: CULP, net sales ~$204M FY2026), an adjacent industrial-fabric name (Albany International, NYSE: AIN, engineered woven fabrics for paper machines — machine-clothing segment ~$708M in 2025, more than 80% from paper-machine clothing), and an upstream yarn proxy (Unifi, NYSE: UFI, recycled-polyester yarn REPREVE, revenue ~$571M FY2025).[1]
• The real assets are private — large family-owned and private-equity-backed weavers such as Milliken & Company, Glen Raven (Sunbrella), Elevate Textiles (Cone Denim, Burlington — though Elevate agreed to sell a majority stake in Cone Denim to Artistic Milliners in a transaction expected to close Q1 2026), and Mount Vernon Mills (approximately 750 employees, six U.S. facilities, and potential output of 90 million yards annually at its Trion, Georgia facility).[1]

See §4 of the 313210 primer for the full table, scale figures, and detail. Reserve tickers, valuation multiples, and yields for that discussion — at this rollup level the takeaway is simply that direct, sizeable exposure to U.S. broadwoven weaving is largely a private-market activity.

5. How the money works

A weaving mill is a fixed-cost, throughput business — analyze it like any capacity-utilization manufacturer, not a utility or a REIT:

• Output is measured in yards of fabric and loom-hours; plants run around the clock and the enemy is idle capacity.
• Capacity utilization is the single biggest swing factor in profitability, because so much cost is fixed (looms, yarn-preparation lines, dyeing/finishing ranges).
• The core spread is the "mill margin": fabric price minus purchased yarn/fiber, minus conversion cost (labor, energy, dyes, maintenance). Yarn is the largest variable cost — Culp states that raw materials represent approximately 60–70% of its mattress-fabric production cost, including synthetic yarns, greige goods, adhesives, laminates, dyes, and chemicals.[1]
• Results are cyclical and input-cost-sensitive — cotton is weather/commodity-driven, synthetics are oil-linked — and money is made by escaping commodity weaving into branded, technical, and defense-grade fabrics.[1]

Full detail, including vertical integration and the mill-margin walk-through, is in §5 of the 313210 primer.

6. Demand drivers

The same drivers apply at this level as at 313210: home furnishings (mattresses, upholstered furniture — the most cyclical driver), apparel (jeans, workwear, uniforms), automotive (seating, airbags), industrial and technical fabrics (filtration, medical, protective — the growth segment), defense (steady, domestic-only demand), and trade-policy/traceability demand created by tariffs, the 2025 de minimis repeal, and forced-labor import bans.[1]

Product substitution is a risk to watch. Knitted mattress fabrics have expanded from premium products into mid- and lower-price mattresses and are now used in nearly all compressed or boxed bedding — direct substitution away from some woven ticking, not simply growth in "textiles."[1] See §6 of 313210.

7. Regulation

Regulation is unusually central here, because trade and procurement rules are what create domestic demand. The key levers — the Berry Amendment (100% U.S. content for Department of Defense textiles), yarn-forward rules of origin in USMCA and CAFTA-DR, the 2025 de minimis repeal (effective August 29, 2025, ending the exemption that let over 1.36 billion low-cost parcels enter duty-free in 2024), and forced-labor import bans (Xinjiang cotton) — apply to 31321 exactly as to 313210.[1][8][9] Product-safety (flammability), environmental (EPA's Textile Mills Effluent Guidelines, 40 CFR Part 410), and worker-safety (OSHA cotton-dust standard, 29 CFR 1910.1043) rules round out the compliance burden.[10][11] See §7 of 313210.

8. Consolidation

The industry is fragmented and only moderately concentrated. The top 4 firms hold about 34% of receipts, the top 8 about 45.9%, the top 20 about 70.6%, and the top 50 about 88.6%; the Herfindahl-Hirschman Index (HHI, a standard concentration gauge where under 1,500 is "unconcentrated") is just 441.9.[4] The U.S. has lost dozens of mills over the past few years and is "down to its last ~100 cotton mills," with import competition the cited cause.[12] Consolidation proceeds by attrition and roll-up — weak commodity mills exit while survivors scale up, roll up heritage brands under private equity, or specialize into defensible technical niches.[1] See §8 of 313210.

9. Risks

The risks are those of the single child: trade-policy reversal (the recent tailwind is political and could unwind), structural import competition, input-cost volatility (cotton and oil-linked synthetics), cyclical end-markets (housing, furniture, autos, apparel), customer offshoring, product substitution (knit fabrics displacing woven in mattresses and bedding), compliance and environmental cost (EPA wastewater rules and OSHA cotton-dust standards are ongoing burdens), and capital intensity with low commodity-end returns — the classic capital-trap that led Berkshire Hathaway, itself once a New England broadwoven weaver, to exit textiles entirely.[1] See §9 of 313210.

10. How to invest & outlook

How to invest. Public routes are thin: the closest pure-play is a micro-cap (Culp/CULP), the best listed industrial-weaving name is adjacent (Albany International/AIN), and the cleanest proxy for U.S.-made synthetic-fabric demand is an upstream yarn supplier (Unifi/UFI). Meaningful, sizeable exposure to the core industry is a private-market activity — direct or PE ownership of the private majors and niche technical mills, or exposure through downstream brands (furniture, bedding, workwear, defense apparel).[1]

Outlook. The base case is a stabilizing-to-modestly-improving domestic industry, not a growth story. The 2025 trade shifts are the most favorable demand backdrop in years and should support onshore fabric orders if they persist; steady Berry-Amendment defense demand provides a floor; Glen Raven's announced $250 million expansion program — targeting more than 30% additional production capability and more than 400 jobs — is tangible evidence that differentiated players see investable opportunity.[1][13] The durable strategic direction is up-market into technical, performance, protective, medical, and automotive fabrics. Against that, results stay cyclical, input-cost-sensitive, and politically contingent.[1]

For full detail on every section above, read the child primer: NAICS 313210 — Broadwoven Fabric Mills.

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Sources

1. NAICS 313210 primer (Histometrics), "Broadwoven Fabric Mills (U.S., NAICS 313210): An Investor's Primer" — the single child of 31321; carries the full scope definition, investable universe, economics, demand drivers, regulation, consolidation, risks, and outlook, with its own underlying sources (U.S. Census 2022 NAICS definition; Culp, Albany International, and Unifi filings; Milliken/Glen Raven/Elevate/Mount Vernon company profiles; Berry Amendment and CAFTA-DR/USMCA trade rules; CBP de minimis suspension; NCTO/industry analyses). 2026.
2. U.S. Census Bureau, County Business Patterns (CBP), NAICS 31321 — establishments (234), employment (13,276), annual payroll (~$639.8M), Q1 payroll (~$173.1M), 2023. https://data.census.gov (CBP 2023)
3. U.S. Bureau of Labor Statistics, "Industries with employment decreases from 2000 to 2024" (broadwoven fabric mills: 120,867 jobs in 2000 to 18,412 in 2024), 2025. https://www.bls.gov/opub/ted/2025/industries-with-employment-decreases-from-2000-to-2024.htm
4. U.S. Census Bureau, 2022 Economic Census — Concentration and industry statistics, NAICS 31321: firms (228), receipts (~$3.63B), CR4/CR8/CR20/CR50 (34% / 45.9% / 70.6% / 88.6%) and HHI (441.9), 2022. https://data.census.gov
5. U.S. Census Bureau, 2002 Economic Census — NAICS 313210 (758 establishments, 80,530 employees, $11.381B shipments), 2002. https://www2.census.gov/library/publications/economic-census/2002/manufacturing-reports/industry-series/ec0231i313210.pdf
6. Global Textile Times / National Council of Textile Organizations (NCTO), U.S. textile supply-chain employment (453,122) and shipments ($60.9B), 2025. https://www.globaltextiletimes.com/news/ncto-calls-for-stronger-us-trade-measures-to-combat-forced-labour-in-textile-imports/
7. U.S. Small Business Administration, "Table of Size Standards," broadwoven fabric mills (1,000 employees), 2023. https://www.sba.gov/document/support-table-size-standards
8. U.S. Customs and Border Protection, "Suspension of Duty-Free De Minimis Treatment" (effective Aug. 29, 2025), 2025. https://www.cbp.gov/sites/default/files/2025-08/factsheet_suspension_of_duty-free_de_minimis_treatment.pdf
9. Just-Style, "US textile sector praises end of de minimis for all countries" (1.36 billion de minimis shipments in 2024), 2025. https://www.just-style.com/news/us-de-minimis-textile/
10. U.S. Environmental Protection Agency, "Textile Mills Effluent Guidelines" (40 CFR Part 410), 2024. https://www.epa.gov/eg/textile-mills-effluent-guidelines
11. U.S. Occupational Safety and Health Administration, "Cotton Dust Standard" (29 CFR 1910.1043), 2024. https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1043
12. American Journal of Transportation (AJOT), "America is down to its last 100 cotton mills," 2024. https://www.ajot.com/news/america-is-down-to-its-last-100-cotton-mills
13. Glen Raven, "Glen Raven Announces Next Phase $250 Million Capacity Expansion" (>30% additional capability; >400 jobs), 2025. https://www.glenraven.com/glen-raven-announces-next-phase-250-million-capacity-expansion/