Open Back Swimwear

Swimwear with open, low or crisscross backs — a construction detail built for the beach-day look, with adjustable straps to keep it in place. 138 styles, mostly one-pieces, from about $19.

137 products

Maiô esportivo de uma peça com costas abertas – Sunnybikinis

Maiô esportivo de uma peça com costas abertas – Sunnybikinis

$71.99
Maiô de maternidade sem costas – Sunnybikinis

Maiô de maternidade sem costas – Sunnybikinis

$28.99
Maiô de maternidade estampado com letras plus size

Maiô de maternidade estampado com letras plus size

$41.35
Maiô patriótico profundo com costas abertas nas costas

Maiô patriótico profundo com costas abertas nas costas

$38.95
Sexy manga curta com tanga nas costas e maiô de uma peça

Sexy manga curta com tanga nas costas e maiô de uma peça

$31.18
Maiô brasileiro atlético com recorte em V profundo

Maiô brasileiro atlético com recorte em V profundo

$33.30
Maiô brasileiro enfeitado com cristais

Maiô brasileiro enfeitado com cristais

$33.25
Maiô com recorte atrevido de perna alta com anel de cristal brilhante

Maiô com recorte atrevido de perna alta com anel de cristal brilhante

$38.60
Biquíni sexy com cordão e plissado

Biquíni sexy com cordão e plissado

$39.99
Maiô brasileiro de corte alto com costas baixas e leopardo

Maiô brasileiro de corte alto com costas baixas e leopardo

$39.85
Maiô de uma peça com frente única e costas baixas

Maiô de uma peça com frente única e costas baixas

$36.80
Sexy com nervuras O Ring Cutout Low Back Monokini Maiô

Sexy com nervuras O Ring Cutout Low Back Monokini Maiô

$34.01
Sexy Scrunch Low Back Deep V Pipoca Maiô de uma peça

Sexy Scrunch Low Back Deep V Pipoca Maiô de uma peça

$34.01
Maiô de uma peça com leopardo contrastante selvagem e profundo em V

Maiô de uma peça com leopardo contrastante selvagem e profundo em V

$33.24
Plus Size Sexy Sólido Corda Sem Encosto Maiô De Uma Peça

Plus Size Sexy Sólido Corda Sem Encosto Maiô De Uma Peça

$31.17
Cobra Strappy Lace Up Backless Maiô de uma peça

Cobra Strappy Lace Up Backless Maiô de uma peça

$34.81
Maiô de uma peça com recorte triangular com tiras arco-íris

Maiô de uma peça com recorte triangular com tiras arco-íris

$32.47
Sexy Neon O Ring Recorte Maiô Brasileiro de Uma Peça

Sexy Neon O Ring Recorte Maiô Brasileiro de Uma Peça

$34.01
Tie Dye O Ring Cutout Maiô brasileiro de uma peça

Tie Dye O Ring Cutout Maiô brasileiro de uma peça

$33.98
Maiô brasileiro com recorte enrugado e enrugado

Maiô brasileiro com recorte enrugado e enrugado

$32.98

What 'open-back' means

Open-back is a construction detail, not a fabric. It describes the back of the suit — open, low or cut across the shoulders or spine — on an otherwise standard one-piece or bikini. The front, the support and the coverage are unchanged; the back is simply finished differently.

What keeps the style in place is the strap system: adjustable, crisscross or racerback-style anchoring at the front and shoulders. That is why strap adjustability matters more on an open-back suit than on a fully-featured back.

What's in the pool

138 styles, led by one-pieces — the open back is fundamentally a one-piece construction feature — with open-back bikinis alongside for those who want the same back line in two pieces.

The honest read: this is the store's open-back construction range. Not every style in the store has an open back, and not every one-piece does — only the styles built with the open, low or crisscross back are here.

Open back vs. performance

The open back is a style and sunbathing choice. Swimmers who do frequent laps tend to prefer a solid back with no cutouts — it moves less and stays anchored stroke after stroke — so the two reads of 'one-piece' are different animals: the open-back for the beach day, the solid-back for the water.

Both can be worn for casual swimming; the difference is what you are optimizing for. If the session is mostly in the water, lean solid back and check the active-swimsuits page. If it is mostly poolside, the open back is the look.

The store behind the page

Sunnybikinis.com is a US swimwear store with hundreds of styles across bikinis, one-pieces, tankinis and swimwear layers, most from about $19. This collection reads the range through the lens of the open-back construction.

Frequently asked questions

What is an open-back swimsuit?

A swimsuit with an open, low or cut-out back — the construction detail is on the back, not the fabric. One-pieces are the most common form, but open-back bikinis and bodysuit-style cuts exist too. Adjustable or crisscross straps are what keep the style in place.

Is an open-back swimsuit secure in the water?

Look for adjustable or crisscross straps and a back band that sits snug. For casual swimming and poolside, a well-fitted open-back one-piece holds fine; for active, repetitive strokes, many swimmers choose a solid back because it moves less — that is a preference, not a rule.

One-piece or bikini for an open back?

One-pieces dominate the open-back style because the open back is a one-piece construction feature. An open-back bikini gives the same look in two pieces, with more freedom of movement but less built-in support.

Does an open-back swimsuit help with tanning?

It exposes more of the back, which is why the style is popular for sunbathing and beach days. How quickly you tan depends on skin type and sun exposure — pair it with your usual sun protection and reapply as directed on your product.

Can I swim laps in an open-back swimsuit?

You can, but it is a style choice rather than a performance one. Swimmers who train often tend to prefer a solid, high-back cut that stays put stroke after stroke. For laps, the active-swimsuits page is the better fit.

Can I wear an open-back swimsuit if I have a larger bust?

Yes — the back cut does not change the front support. Look for a lined or underwire cup and a supportive band at the front; the open back is independent of the bust support. The dd-cup page covers front-support options in detail.

How do I style an open-back swimsuit?

The open back shows more of the back, so a front-opening or wrap cover-up keeps the look working on land. On the water the style stands alone — the back line is the point.

What is in this collection?

138 styles, led by one-pieces with open, low and crisscross backs, plus open-back bikinis. The pool is the store's open-back construction range — every style here carries the open-back detail.