An underwire bikini top can provide lift, separation and structure while still feeling comfortable enough for a full beach day. The key is choosing the right cup and band fit.

How underwire swimwear works

The wire sits beneath the bust and helps support the cups. Many underwire swim tops also include adjustable straps, halter ties, molded cups or removable straps so you can customize the fit.

Check the wire placement

The wire should sit flat against your ribcage and surround the breast tissue without resting on it. If the wire floats, pinches or sits too low, try another cup size or silhouette.

Check the band

The band supplies much of the support. It should feel snug and level around your body without riding upward. Adjustable ties can help fine-tune the fit, while clip-back styles should close securely without strain.

Check the cups and straps

Cups should lie smoothly without gaping or overflow. Straps should stay in place without carrying all the weight of the top. Adjust them until they feel supportive but not tight.

Choose your swimwear size

Swim sizing can differ from everyday bras, so use current measurements and review our size chart. Product descriptions can also indicate whether a style has molded cups, adjustable straps or other supportive features.

Browse our bikini tops to compare underwire, bandeau, halter and molded-cup styles, then pair your favorite with a coordinating bottom.