Elastane and Spandex Explained
In brief: Elastane is a synthetic fibre containing at least 85 percent segmented polyurethane, invented by DuPont chemist Joseph Shivers in 1958. The terms elastane in Europe, spandex in North America and Lycra as a brand name all describe the same material. It can stretch 500 to 700 percent beyond its original length and recover almost completely. Typical blends use 2 to 5 percent for comfort stretch and 15 to 25 percent for compression and performance wear.
What is elastane?
Elastane is the synthetic stretch fibre responsible for the comfortable give in a huge range of modern clothing. By definition it contains at least 85 percent segmented polyurethane, and it was invented in 1958 by the DuPont chemist Joseph Shivers. One point that confuses many shoppers is its many names: elastane is the standard term in Europe, spandex is the common name in North America, and Lycra is a well-known brand name. All three describe chemically identical material. Elastane is almost never used on its own; instead it is blended in small amounts with other fibres to add stretch.
How elastane stretches and recovers
The remarkable property of elastane is the combination of huge stretch and strong recovery. The fibre can extend 500 to 700 percent beyond its original length without breaking, and then return close to its starting shape. Premium variants exceed 95 percent recovery even after 200 stretch cycles, which is why a good stretch garment keeps its shape rather than bagging out at the knees or elbows. This elasticity comes from the segmented polyurethane structure, which behaves a little like a microscopic network of springs, allowing the fibre to be pulled out and snap back time after time.
How much elastane is in clothing
The amount of elastane in a fabric is deliberately matched to the job. For everyday comfort stretch in shirts, trousers and denim, a small proportion of around 2 to 5 percent is typical, enough to add ease of movement and help the garment recover its shape without changing the character of the main fibre. For compression and performance wear, where the fabric needs to hug and support the body, much higher proportions of around 15 to 25 percent are used. Reading the elastane percentage on a label tells you a lot about how a garment is meant to feel and perform.
Why elastane is everywhere
Elastane has become near-ubiquitous because a little of it transforms how clothes wear. It makes tailored garments more comfortable, helps knitwear and denim hold their shape, and is essential to activewear, swimwear and shapewear. Practical formulations are also engineered to resist body oils, perspiration and even chlorine, so stretch garments survive real-world use, sweat and swimming pools. The trade-off is that elastane is sensitive to high heat, so stretch garments should be washed cool and kept away from hot tumble drying to preserve their elasticity over time.
Elastane at OD's Designer Clothing
At OD's Designer Clothing, elastane appears across our ranges wherever comfort, movement and shape retention matter, from stretch denim and tailoring to activewear. A small percentage on the label is often what makes a garment feel as good as it looks. We offer next-day delivery and free click and collect, and customers in the North West are welcome to try styles on in person at our St Helens store.