Bra with or without an underwire

Short answer: An underwired bra gives shape and support, while a wire-free style is softer and moves with the body. For long days and for sleep, wire-free styles are usually the most comfortable, while underwire suits days when shape matters most.

What the underwire does

The wire lifts and holds the shape, and it spreads weight out to the sides rather than leaving everything to the straps. That gives a clear silhouette under a fitted top. In return it needs an exact fit, because a wire in the wrong place is quickly felt. Browse our bamboo underwear for women.

Wire-free means more movement

A soft style follows the body and does not press in one spot, and many people can wear it all day without marks. The fabric and underband do the work instead of a fixed frame. It is the same idea as the soft ribbed top of bamboo socks for men and women, which holds without squeezing.

Fit matters most

Whatever the style, size decides comfort. The underband should sit level and firm without digging in, and the cups should cover without gaping or pressing. With a wire there is less room for error than without. Measure yourself again if you are unsure, since bodies change over time.

Choose by the day

For a long day at home, at a desk or travelling, a wire-free style is often the most comfortable. For a day when shape matters, such as under a thin dress or a fitted top, underwire may be right. See the full range of women's clothing to find what suits your days.

At night

Many people prefer to sleep without a bra, but if you want a little support, a soft wire-free style is the obvious choice. A wire can press when you lie on your side and make it harder to relax. Pick a soft fabric and a wide band so it stays calm all night.

The fabric makes a difference

A bra sits close to the skin all day, so the fabric matters. Soft bamboo viscose gives less friction and feels calm against the skin. Without a wire the fabric matters even more, because it holds the shape rather than a frame. Choose a style with some stretch that recovers after wear.

Washing and care

Wash your bra in a laundry bag at a low temperature so the band and any wires do not bend. Fasten the hooks before washing so they do not catch on other clothes. Dry it flat and avoid the tumble dryer. A soft wire-free style is a little tougher, but it also benefits from gentle care.

One of each

Many people end up with both types, since they suit different days. One or two soft styles for everyday and sleep, plus one underwired bra for days when shape matters more, covers most needs. Then you choose by the day instead of settling for a compromise.

Frequently asked questions

Does underwire leave marks

Only if the size is wrong. A wire that fits sits calmly against the body and is barely noticed, even after a long day.

Can you sleep in a bra

Yes, if it is soft and wire-free. An underwired bra can press when you lie down, so most people choose a soft style for the night.

Which lasts longest

The wire-free one, because there are fewer parts that can fail. Wires can work their way through the fabric over time, especially when washed without a bag.