Best Strapless Bras: How to Choose One That Stays Up

The best strapless bra is one with a firm, wide band (three or more hooks), silicone grip along the edges, side boning, and cups that fully contain you. Those features, plus the right size, are what keep it up. Bravissimo sums up the goal: strapless bras are “designed to keep you secure and supported under strapless outfits”.

What keeps a strapless bra up

Without straps, the band does all the work. Wacoal says the band provides 70% of a regular bra’s support; in a strapless it’s close to all of it. So look for:

• A wide band, ideally with three or more rows of hooks. Narrow bands roll and slip.
• Silicone grip along the top edge of the cups and the band. It holds the bra against your skin.
• Side boning or stiffened side panels that keep the band upright.
• Wider, taller wires that anchor the cups and stop them tipping.
• A firm, low-stretch fabric in the band.

How to size a strapless bra

Start with your usual size, then check the band carefully:

• The band should be firm on the loosest hook, firmer than you’d accept in a strapped bra.
• If it slides down when you raise your arms, try one band size smaller with one cup larger. A 36C becomes a 34D, for example. That’s the sister size, so the cups hold the same.
• The cups should fully contain you. Cups that are too small push the bra down as you move.

Our sister size calculator shows your sister sizes in any system.

Molded vs seamed strapless bras

If you wear a D cup or larger, our guide to strapless bras for large breasts goes deeper.

Types of strapless bra

• Balconette strapless: the most common shape, with a straight top edge.
• Plunge strapless: lower center for V-necklines.
• Longline strapless: a deeper band down the ribs for extra hold.
• Convertible: detachable straps you can add back for halter or crisscross looks.
• Bandeau: a soft tube style with light support, best for smaller busts.
• Adhesive: no band at all, for open backs. See our guide to choosing a bra for a backless dress.

How to test a strapless bra before your event

1. Wear it for a few hours at home in the outfit you’ll wear.
2. Lift your arms above your head, sit, bend and dance a little.
3. Check the back: the band should stay level and not roll.
4. Check the cups: nothing should spill or gape as you move.
5. Look for red marks after a few hours. A little is normal; pain isn’t.

If it slips during the test, try the tighter hook or the smaller band. If it still slips, the shape isn’t right for you.

Can you make a regular bra strapless?

Only if it has detachable straps. Our guide on how to make a bra strapless explains when that works.