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:

• 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. 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 apply to 31321 exactly as to 313210: 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).[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/