Covered elastic versus bare elastic

Short answer: An elastic spun round with yarn lies softly against the skin. A bare rubber thread chafes and turns sticky over time.

The difference between the two

A covered elastic has a rubber core wrapped in soft yarn, so it is the yarn and not the rubber that touches the skin. A bare elastic is rubber all the way round the outside.

What you feel

Bare elastic feels smooth and slightly tacky, especially when you sweat. Covered elastic feels like fabric. Over a full day the difference is clear. See bamboo underwear for women.

Where you see it

In waistbands, leg openings and bra straps. Look at whether the edge looks like fabric or like a rubber cord. See bamboo briefs for women and bamboo bras without underwire.

Frequently asked questions

Does covered elastic last as long

Yes. The yarn actually protects the rubber from light and abrasion.

Why does old elastic turn sticky

The rubber breaks down from heat and sweat and becomes tacky on the surface.

Can you see it in a photo

Rarely. It is easier to check with your hand.