Stretch clothing and what elastane actually does

Short answer: Elastane is a very elastic fibre that is blended in small amounts into fabrics to give stretch and help clothes spring back into shape. It makes clothes more comfortable to move in, but elastane does not like high heat. Here is what that means in practice.

What elastane is and what it is used for

Elastane is a synthetic fibre that can stretch to many times its length and pull back again. It is rarely used on its own, but blended into other fibres. When you see elastane on the care label, it means the fabric has stretch and recovers its shape after use.

Why stretch clothing feels good to move in

Stretch clothing gives way when you bend, raise your arms or sit down, and pulls back afterwards. That is especially nice in underwear, socks and close-fitting t-shirts. Clothes without stretch can feel tight across shoulders and knees if the size is snug.

How much elastane is in the clothes

Always check the fibre composition on the label, because it varies from piece to piece. If elastane is listed as a small share, it means a little stretch, and with more the fabric becomes more elastic. For bamboo clothing for men, look at the product description, where the composition is stated.

Elastane and heat

Elastane is sensitive to high heat, which can make the fabric limp and less elastic. Wash at the temperature on the label and avoid strong heat in the tumble dryer. Hang the clothes to dry when you can, and the stretch will last longer.

Why stretch clothing loses its shape

When stretch clothing wears out, it can go loose, especially at the waistband, the knees and the cuffs. This comes from both wear and heat. Rotate between several pieces and wash gently so the stretch lasts longer. A piece that has gone limp cannot always be restored.

Stretchy socks and fit

In socks, elastane helps keep them in place without cutting into the skin. Try different models and check that the cuff does not squeeze the calf. Look at socks for men if you want something that stays put through the day.

Fit in long-sleeved pieces

Clothing with a little stretch follows the body at the sleeves and shoulders, so you can move freely. That is an advantage in long sleeve models, where the sleeves can otherwise pull. Stretch does not mean you can pick a size too small, though.

Is elastane something to avoid

It depends on what you want from the clothes. Elastane gives comfort and fit, but it is a synthetic fibre that does not have the same properties as natural fibres. If you have an allergy or sensitive skin, read the label and talk to your doctor if you are in doubt.

Frequently asked questions

What does elastane do in clothes?

Elastane gives clothes stretch, so they follow your movements and spring back into shape afterwards. It is usually present in small amounts blended with other fibres, for example in socks, underwear and t-shirts.

Can elastane go in the tumble dryer?

Elastane is sensitive to high heat, so hanging to dry or low heat is best. Always follow the care label so the fabric keeps its stretch as long as possible.

Why do clothes with elastane go loose?

The stretch wears down over time through use, washing and heat. Rotate between several pieces and wash gently so the shape lasts longer, but worn stretch cannot always be restored.

You can find the full range at Copenhagen Bamboo.