An underwire bikini top is a women’s swim top with a thin wire under the cup — the same construction as an underwire bra, adapted for swimwear. The wire gives structural lift and shape that fabric alone cannot match, making underwire bikini tops the most supportive swim top style and the standard choice for fuller busts (DD and above).
This collection covers our women’s underwire bikini top range. Most styles combine the underwire structure with shaped cups (molded foam or soft fabric cups depending on the style), adjustable shoulder straps, and a hook-and-eye back closure that lets you adjust the band tightness like a regular bra. The fabric is chlorine-resistant polyamide-elastane with double lining for opacity. Underwire styles pair naturally with any bikini bottom cut.
Are underwire bikini tops more supportive than other styles? Yes — significantly. The thin wire under the cup gives structural lift that holds the bust in place during movement, swimming, and active water sport. For D cup and above, underwire bikini tops are usually the only style that gives all-day comfort and security. Triangle and bandeau tops without underwire give less structural lift.
How should an underwire bikini top fit? The same as an underwire bra — the band should sit level and snug across the back at the underbust, the cups should hold the bust without spillover or gapping, and the wire should sit flat against the ribcage without poking. Adjustable straps should support without digging in. If the wire pokes at the side or the cups gape, the cup size is wrong.
What size underwire bikini top should I choose? Underwire bikini tops use band-and-cup sizing (like a bra) — for example, “32C” or “75C” depending on the system. Measure your underbust for the band size and your fullest bust for the cup size, just like fitting a regular bra. Many styles list both EU (cm) and UK/US (inches) sizes; use the system that matches your usual bra sizing.
Do underwire bikini tops work for swimming? Yes — the underwire structure stays in place during swimming and water sport, giving more security than triangle or bandeau styles. The wire is corrosion-resistant on quality swimwear, so chlorine and salt water don’t damage the wire over time. The fabric and elastic are the wear factors; the wire itself usually outlasts the rest of the top.
How do I care for underwire bikini tops? Rinse with cool fresh water immediately after every swim. Hand wash cold with mild detergent — never machine wash, the wire can bend or come loose from the cup. Skip fabric softener and the dryer. Lay flat to dry, supporting the cups so the molded shape stays intact. Store flat or hanging from the band, not from a shoulder strap.










































