Women's Underwire Swimsuits: Shop by Style, Detail & Fit

Underwire swim tops bring bra engineering to the beach: a flexible wire in each cup lifts, separates, and anchors, delivering the support and shape that soft swim tops cannot. For fuller busts, it is the difference between swimming and merely getting wet.

Underwire suits fuller busts (D cup and up) better than any other swim construction — the wire does what no amount of elastic can. They also create the most defined, lifted shape under clothing-like swim dresses and structured one-pieces. The wire must sit flat against the ribcage, encircling tissue without pressing on it; if it digs or floats, the size is wrong, not the concept.

Swim-Specific Wire Notes

Swim underwires are typically plastic-coated for corrosion resistance — check that the casing is fully sealed, since a breached wire and salt water end badly. Rinse meticulously: trapped chlorine attacks wire casings faster than any other component. And never wring an underwire suit — twisting warps wires permanently.

Who Can Skip It

Smaller busts often prefer the comfort and simplicity of soft cups — underwire is available, not mandatory. The right choice is the one that makes you forget about your suit and enjoy the water.