LYCRA®

Overview

A familiar branded elastane offering within a wider technology portfolio. The word is often used loosely, so read the generic composition.

Feel and behavior

Depends on the specified fiber grade, yarn and fabric construction.

Where you find it

See the linked underlying material and the producer’s product-specific documentation.

Source and geography

LYCRA is the principal elastane brand of The LYCRA Company, headquartered in the United States; the brand grew out of DuPont's synthetic-fiber business. The generic fiber is spandex (US) or elastane (EU), a segmented polyurethane. Ownership has changed repeatedly: Shandong Ruyi bought the company in January 2019, its lenders took control in 2022, and after a prepackaged Chapter 11 case in 2026 control passed to investment funds that had held the company's debt. Readers should confirm the current owner with the company.

Worth knowing

• LYCRA T400 fiber, despite the LYCRA name, is a bicomponent polyester and appears on labels as polyester, elasterell-p or elastomultiester rather than spandex.
• The LYCRA Company certifies fabrics before issuing free hangtags, so a genuine tag indicates a certified fabric, not just the presence of fiber.

Types, grades and fabrics

Types and grades

The LYCRA name covers two chemically different fiber families. LYCRA fiber proper is spandex (elastane), a segmented polyurethane supplied in many deniers for hosiery, swimwear, shapewear and blends. LYCRA XTRA LIFE fiber, marketed under the lastingFIT technology name, is a modified spandex that the company says resists fiber damage from external agents that wear out ordinary spandex; the same technology label can also use LYCRA T400 fiber. LYCRA T400 is not spandex at all but a bicomponent polyester, which the company labels elasterell-p (a US polyester subclass) or elastomultiester in the EU; LYCRA T400 EcoMade contains more than 65% recycled and plant-based content, per the company. LYCRA FiT400 targets knitwear.

Fabrics and products

Spandex is almost never used alone: it is core-spun with cotton or wool, covered with nylon or polyester, air-entangled, or knitted bare alongside other yarns. Typical products are jeans and stretch chinos (a few percent spandex), T-shirts and knit tops, leggings and sports bras (with much higher spandex shares), swimwear, hosiery, bras and shapewear. T400 appears in stretch wovens, denim and trousers where moderate, comfortable stretch and wrinkle recovery are wanted without elastane's sensitivity to heat. The same company's portfolio also includes COOLMAX and THERMOLITE performance brands.

Buying and care

How to judge quality

The content label must show spandex or elastane for LYCRA fiber, and polyester (or elasterell-p or elastomultiester) for T400; a label saying only 'LYCRA' is incomplete. Genuine branded fabric carries a LYCRA hangtag: the company offers free printed or virtual hangtags for fabrics that pass its certification, which checks that they contain genuine LYCRA technologies and meet its performance standards. In the fabric, stretch it and watch recovery: good spandex fabrics snap back fully, while grinning (the spandex showing through when stretched) or bagging at knees and seat signals low content or poor construction. 'Lycra' as a common noun in listings does not mean branded fiber.

Care in detail

Wash stretch garments cool (30 C), inside out, on a gentle cycle with mild detergent; avoid chlorine bleach entirely, since chlorine attacks spandex. Rinse swimwear in fresh water after pools or sea. Skip fabric softener, which can coat fibers and reduce recovery in performance knits. Heat is the main enemy: line dry or tumble on the lowest setting, and never leave stretch items on radiators or in hot cars. Iron only if the label allows, quickly and at the lowest setting (about 110 C), avoiding the stretch areas. Store flat or folded, not hung by stretched straps. Lotions and body oils shorten spandex life; wash activewear after each use.

Care at a glance

Follow the finished product’s care label. A trademark does not specify the care needs of every blend or construction.

Environmental and social footprint

Spandex production uses diisocyanates and, in the dry-spinning route, polar solvents such as dimethylacetamide that must be recovered; detailed, audited plant-level data for LYCRA grades were not found for this entry, and the company's EcoMade recycled and bio-derived claims are producer statements. The best-documented independent concern is end of life. Elastane is present in a large share of apparel at low percentages, and a 2026 review in Polymers (Plavec and colleagues) notes that post-consumer textiles containing elastane, dyes and finishes make selective recycling considerably more difficult, because the polyurethane responds differently from cotton or polyester to separation chemistry. Durability-focused grades such as XTRA LIFE can reduce impact indirectly if garments last longer, but that benefit has not been independently quantified.

Tradeoffs

Producer claims apply to defined products and comparisons. This atlas does not independently certify performance, sourcing or environmental claims.

A useful question to ask: Which exact grade, composition and current producer documentation apply to this product?

Science

Data sheet

Engineered organic polymer

Polymer chemistry and fiber-forming conditions determine the starting material.

Structure and chemistry

Spandex is a block copolymer in which long, flexible soft segments (typically polyether or polyester glycols) alternate with short, rigid hard segments formed from an aromatic diisocyanate chain-extended with diols or diamines, giving urethane and urea linkages. The hard segments aggregate into hydrogen-bonded domains that act as physical cross-links, while the soft segments are amorphous and coil above their glass transition. Stretching uncoils the soft segments; the hard domains pull the network back when the load is removed. Filaments are usually coalesced multifilaments.

From source to yarn

In the conventional route for spandex, a macroglycol is capped with excess diisocyanate to form a prepolymer, which is chain-extended (commonly with a diamine) in a polar solvent such as dimethylacetamide. The polymer solution is dry-spun: extruded into a heated column where the solvent evaporates and is recovered, and adjacent filaments fuse into a coalesced yarn. Finish is applied and the yarn is wound. Mills then combine it with other fibers by core spinning, covering, air-jet entangling or direct knitting. The LYCRA Company's grade-specific processes are proprietary.

Performance in use

Spandex can extend several times its length and recover, which is why small percentages transform fit and shape retention. Moisture regain is low. It is degraded by chlorine, prolonged heat, UV and some body oils, which cause loss of recovery over time; chlorine-resistant grades exist. High heat-setting temperatures can damage it, so blends are processed carefully. It takes acid and disperse dyes with variable fastness. Performance claims for particular LYCRA grades are producer statements tied to those grades.

How it is identified

Burn tests are indicative only: spandex melts and burns with a chemical odor, leaving a soft, sticky residue, and in blends the small elastane fraction is easily masked. Microscopy of stretched fabric can show the fine elastic core or coalesced filaments. FTIR identifies polyurethane; quantitative analysis of blends uses selective dissolution. The word LYCRA is often used loosely for any stretch fabric or for elastane from other producers.

History

Timeline

1. 1959DuPont chemists, including Joseph Shivers, developed spandex, the segmented polyurethane fiber later sold as LYCRA, according to a fabric-industry history. [2]
2. 2019Shandong Ruyi completed its purchase of The LYCRA Company in January. [3]
3. 2022Lenders took control of The LYCRA Company after the Shandong Ruyi purchase ended in default. [4]
4. 2026The LYCRA Company filed a prepackaged Chapter 11 case in the Southern District of Texas on 17 March and emerged on 20 May with more than 1.2 billion dollars of debt eliminated. [5]

LYCRA became closely associated with stretch clothing. Its brand history follows the expansion of elastane into everyday apparel and technical fabric systems.

The deeper record

Elastane was developed in the mid-twentieth century as a lighter, more durable alternative to rubber thread, and LYCRA became a widely recognized brand of the fiber in foundation garments, swimwear, hosiery and later denim and sportswear. The business passed from DuPont through a series of owners. Shandong Ruyi's 2019 purchase ended in default, and its lenders took control in 2022. On 17 March 2026 The LYCRA Company filed a prepackaged Chapter 11 case in the Southern District of Texas, emerging on 20 May 2026 with more than 1.2 billion dollars of debt eliminated and new equity owners.

Labeling and law

LYCRA is a trademark, not a generic name. The FTC rules at 16 CFR 303.7 define spandex as a fiber of at least 85% segmented polyurethane, and because Part 303 incorporates the ISO 2076 names, US labels may use either spandex or elastane; EU labels must use elastane under Regulation (EU) No 1007/2011. In the US a fiber under 5 percent can generally be grouped as other fiber, but one with clearly established functional significance, as stretch usually is, is named with its percentage. A trademark may appear only alongside the generic name.

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

Frequently asked

Is LYCRA the same as spandex?

LYCRA is a brand. Most LYCRA fiber is spandex (called elastane in Europe), but the company also sells LYCRA T400, which is a bicomponent polyester, not spandex. The fiber content label shows the generic name.

Why does my stretch fabric go baggy?

Spandex loses recovery after repeated exposure to heat, chlorine, UV and body oils, and when fibers break the fabric no longer snaps back. Cool washing, air drying, rinsing after swimming and avoiding bleach extend its life. Chlorine-resistant grades exist for swimwear.

How much spandex is in stretch jeans?

Usually only a small percentage, often in the low single digits, core-spun inside cotton yarns in the weft. Higher percentages give more stretch but can reduce durability and make recycling harder.

Sources

• LYCRA: Official product information
• Sourcing Journal (WWD): The Lycra Company Emerges from Chapter 11 with $1.2 Billion Debt Reduction
• Financier Worldwide: The Lycra Company files for Chapter 11 and completes restructuring
• The LYCRA Company: Announces New Ownership and Board of Directors (2022)
• WWD: Chinese textile giant Shandong Ruyi transfers Lycra to creditors
• eCFR: 16 CFR 303.7, Generic names and definitions for manufactured fibers
• The LYCRA Company: LYCRA T400 technology, elastomultiester polyester (elasterell-p fiber)
• The LYCRA Company: LYCRA T400 EcoMade fiber
• The LYCRA Company: LYCRA XTRA LIFE fiber (lastingFIT technology)
• Polymers: Selective textile recycling with deep eutectic solvents, a mechanistic framework (Plavec et al., 2026)
• Herculite: Complete guide to synthetic fabrics (history)

Cite this page

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