How to Choose Swimwear That Stays Put in the Water

Quick answer

Choose a bikini top with a defined structure and a snug band, then pair it with a bottom whose waistband sits on your hip bone rather than above it. For swimming, a plunge balcony or push up top with adjustable straps and a high waist or tie-side bottom gives the most reliable hold. Loose, strapless or single-tie styles are the first to shift once you start moving in the water.

A bikini that looks perfect on the sand can feel completely different after one lap in the pool. The difference is rarely the print or the price. It comes down to how the top anchors to your ribcage, how the bottom sits on your hips, and whether the straps and ties can be adjusted to your body rather than a standard size chart.

This guide walks through the decisions that actually keep swimwear in place: band tension, cup structure, strap type, bottom rise and tie placement. It also shows how specific Marlies Dekkers pieces are built for movement, so you can match the construction to how you plan to swim rather than guessing from a photo.

Start With the Band, Not the Cup

Most bikini tops that ride up in the water are too loose around the ribcage, not too small in the cup. The band does the anchoring work. If you can slide two fingers under the band at your back, it will lift when you raise your arms or push off the wall. A snug band that sits level all the way around keeps the cups in contact with your body.

Check this before you look at the cups. Fasten the top, raise both arms overhead and twist gently side to side. If the band shifts upward, size down in the band or choose a style with more adjustability. Only after the band stays level should you assess whether the cup shape and coverage suit you.

• Fasten the top, then raise your arms and twist. If the band climbs, it is too loose.
• The band should sit level at the back, not angled up toward your shoulder blades.
• Adjustable straps help, but they cannot fix a band that is fundamentally too large.

Match Cup Structure to How You Swim

Padded and underwired cups hold their shape better in moving water than soft, unlined cups, because the structure keeps the fabric from collapsing and dragging. A push up bikini top with soft cushions inside the cups adds lift and keeps the cup volume consistent, which matters when you are actually swimming rather than posing.

If you prefer a softer feel, a plunge balcony shape gives support through the cut rather than heavy padding. The trade-off is that balcony styles offer less push-up effect, so choose based on whether you want lift or a more natural line. Neither is wrong; they simply behave differently once you are in the water.

• Structured cups resist collapsing and dragging in moving water.
• Soft cups feel lighter but can fold or shift during vigorous swimming.
• Decide whether you want lift or a natural line before comparing styles.

Choose a Bottom Rise That Stays on Your Hips

Bikini bottoms stay put when the waistband rests on a part of your body that does not taper sharply. A high waist bottom covers the lower belly, hips and buttocks, giving the waistband a stable ledge to sit on. That makes it a strong choice for swimming, especially if you dislike adjusting your bottoms between lengths.

Tie-side bottoms can also work well, but only if the ties are genuinely adjustable and you tighten them properly. A tie and bow bikini bottom with adjustable side ties lets you set the tension yourself, which is useful if you sit between two sizes. The trade-off is that ties need a firm double knot before you get in the water.

• High waist styles sit on a stable part of the hip and resist rolling down.
• Tie-side styles are adjustable but must be knotted tightly before swimming.
• If you sit between sizes, adjustable ties often fit better than a fixed waistband.

Fabric and Finish Affect Grip and Comfort

Smooth recycled polyamide and microfiber fabrics feel soft against the skin and dry quickly, but how they are finished matters. Matte and glossy versions of the same fabric can behave differently against wet skin, and a fabric with a bit of body tends to stay in place better than a very thin, stretchy one.

Digital printing is worth noting for a practical reason as well as an environmental one. Printing digitally saves water and energy compared with conventional methods, and the print sits on the fabric without adding bulk or stiffness. That keeps the piece comfortable while still holding its shape in the water.

• Look for fabric with a little body rather than very thin stretch.
• Smooth polyamide and microfiber dry quickly and feel light when wet.
• Digital prints add pattern without stiffening the fabric.

Test Before You Commit to the Water

Before you swim, do a dry run at home. Put the set on, raise your arms, bend forward, twist and take a few exaggerated strokes. Anything that shifts now will shift more once water and movement are added. This takes two minutes and saves you from adjusting your swimwear mid-swim.

Pay attention to where the straps sit on your shoulders and whether the cups stay flat against your chest. If a strap slips, tighten it. If the cup gapes when you bend forward, the band or cup size is off. Fix the fit at home rather than hoping the water will hold everything in place.

• Do a dry-run test with arm raises, bends and twists before swimming.
• Tighten straps and re-check the band after any adjustment.
• If a cup gapes when you bend forward, revisit the size rather than the style.

Decision Rules for Swimwear That Does Not Move

• If the band lifts when you raise your arms: Size down in the band or choose a style with a firmer, more adjustable band before looking at cup size. Band tension is the first thing to fix, not the last.
• If you swim laps rather than float: Choose structured or padded cups and a high waist bottom, and avoid strapless or single-tie styles that rely on tension alone. Structure beats stretch for active swimming.
• If you sit between two sizes: Pick adjustable side ties or adjustable straps so you can fine-tune the fit yourself instead of compromising on a fixed size. Adjustability is your best fit tool when you are between sizes.
• If you want one piece to do everything: A plunge balcony bathing suit with a structured top removes the risk of a separate top shifting during movement. Fewer pieces means fewer things that can move.

Pieces Built to Stay in Place

• push up bikini top: This push up bikini top enhances your curves with soft cushions inside the cups for added lift, and is crafted from smooth recycled polyamide with a digitally printed floral pattern that saves water and energy. The structured cups and soft cushions keep their shape in moving water, so the top holds its position instead of collapsing and dragging while you swim.
• high waist bikini bottom: These high waist bikini briefs comfortably cover your lower belly, hips and buttocks, combining matte and glossy recycled microfiber with gold-colored metal buckle ornaments at the back. The high rise gives the waistband a stable ledge on your hips, which is the most reliable way to stop bottoms rolling or shifting during laps.
• plunge balcony bathing suit: The plunge balcony top provides ample support while creating a subtle décolleté, and the smooth recycled polyamide is digitally printed to save water and energy. A one-piece with a structured balcony top removes the risk of a separate top riding up, making it a low-maintenance option for active swimming.
• tie and bow bikini bottom: These bikini bottoms are tied at the sides with adjustable ties on both hips, crafted from recycled fabric with a digital flower print that saves 50 to 60 liters of water per meter of fabric. Adjustable side ties let you set the tension to your own hips, which helps the bottom stay put if you sit between sizes, as long as you knot them firmly.

Who This Approach Suits

Best for

• Swimmers who want a bikini top that stays in contact with the body during laps
• Anyone who sits between sizes and needs adjustable ties or straps
• People who prefer a high waist bottom for stable coverage on the hips

Not for

• Anyone who wants a strapless or single-tie style for lounging rather than swimming
• Swimmers who prefer very thin, unstructured cups with no padding

The swimwear that stays put is the swimwear that fits your band, your hips and your swimming style, not the one that photographs best on the sand. Check the band first, choose cup structure that matches how you move, and pick a bottom rise that sits on a stable part of your body. Do a dry-run test at home, and you will spend your time in the water instead of adjusting your swimwear.