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
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  • Black heart ring bikini set with ruched triangle top and high-cut matching bottoms

    Bikini sexy con aro de corazón: traje de baño de corte alto sin espalda

    Bikini sexy con aro de corazón: traje de baño de corte alto sin espalda
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  • Sunnybikinis leopard print one-piece swimsuit, V-neck, backless, thong bottom (khaki)

    Traje de baño de una pieza sin espalda con estampado de leopardo y tanga con cuello en V

    Traje de baño de una pieza sin espalda con estampado de leopardo y tanga con cuello en V
    $33.35
  • Sunnybikinis one-piece swimsuit, black V-neck with ruffled sleeves and front cutout

    Traje de baño de una pieza con escote en V y malla en contraste – Control de abdomen

    Traje de baño de una pieza con escote en V y malla en contraste – Control de abdomen
    $36.25
  • Blue halter bikini set with bow-tied top and patterned bikini bottoms with side bows

    Bikini halter con estampado sexy: traje de baño de vendaje sin espalda

    Bikini halter con estampado sexy: traje de baño de vendaje sin espalda
    $35.65
  • Leopard print halter bikini set: triangle top, tie-side bottoms with string ties

    Conjunto de bikini con lazo lateral y estampado de leopardo

    Conjunto de bikini con lazo lateral y estampado de leopardo
    $34.80
  • Vintage backless bikini set, floral print high-waist bottoms and matching crop top

    Bikini vintage sin espalda con estampado: traje de baño deportivo de cintura alta

    Bikini vintage sin espalda con estampado: traje de baño deportivo de cintura alta
    $33.58
  • Black high-leg one-piece swimsuit, U-wire front, gold buckle detail, thin straps

    Traje de baño de una pieza de pierna alta con aros en U - Traje de baño sin espalda para mujer

    Traje de baño de una pieza de pierna alta con aros en U - Traje de baño sin espalda para mujer
    $37.72
  • Women's color block mesh swimsuit in red and navy with round neck

    Traje de baño deportivo de malla con cuello redondo y bloques de color para mujer

    Traje de baño deportivo de malla con cuello redondo y bloques de color para mujer
    $45.99
  • Red V-neck Brazilian one-piece swimsuit with thin straps
    Oferta

    Traje de baño brasileño de una pieza rojo intenso con escote en V y entrecruzado

    Traje de baño brasileño de una pieza rojo intenso con escote en V y entrecruzado
    $43.55 $73.22
  • Schwarzer Halter-Badeanzug mit Rosen-Applikation und Cut-outs, hoher Beinausschnitt
    Oferta

    Traje de baño brasileño de una pieza con cuello halter y cortes florales

    Traje de baño brasileño de una pieza con cuello halter y cortes florales
    $36.65 $58.38
  • Black glitter sequin one-piece swimsuit with deep V neckline and Brazilian cutout
    Oferta

    Traje de baño brasileño de una pieza con recortes y lentejuelas brillantes

    Traje de baño brasileño de una pieza con recortes y lentejuelas brillantes
    $38.65 $59.15
  • White crochet halter one-piece, deep V front with contrast trim, Brazilian cut
    Oferta

    Traje de baño brasileño de una pieza con escote halter y escote en V profundo de crochet en contraste

    Traje de baño brasileño de una pieza con escote halter y escote en V profundo de crochet en contraste
    $38.65 $59.85
  • White sheer mesh one-piece swimsuit with low back and Brazilian cut
    Oferta

    Traje de baño de una pieza brasileño de malla transparente con espalda baja – Blanco

    Traje de baño de una pieza brasileño de malla transparente con espalda baja – Blanco
    $42.35 $65.28
  • Beiger Häkel-One-Piece mit hohem Ausschnitt, seitlichem Cut-out und Bindeband
    Oferta

    Traje de baño brasileño de una pieza de punto de crochet de lujo

    Traje de baño brasileño de una pieza de punto de crochet de lujo
    $58.85 $103.32
  • Sunnybikinis pink tropical leaf rash guard one-piece swimsuit, long sleeves
    Oferta

    Traje de baño de una pieza con estampado de hojas tropicales

    Traje de baño de una pieza con estampado de hojas tropicales
    $42.25 $65.08
  • Yellow high-leg cutout one-piece swimsuit with oval side cutouts and thin straps
    Oferta

    Traje de baño de una pieza sexy de color amarillo con corte alto y pernera recortada

    Traje de baño de una pieza sexy de color amarillo con corte alto y pernera recortada
    $39.18 $66.85
  • Sheer Sleeve High Leg Cutout Monokini | Sexy Brazilian One-Piece - Black / S On sale
    Oferta

    Traje de baño de una pieza monokini con mangas de malla transparente y aberturas

    Traje de baño de una pieza monokini con mangas de malla transparente y aberturas
    $38.55 $62.90
  • High Leg Thong O Ring Cutout Monokini Brazilian Swimsuit - Black / S On sale
    Oferta

    Traje de baño brasileño monokini con abertura y tanga de pierna alta

    Traje de baño brasileño monokini con abertura y tanga de pierna alta
    $38.88 $66.38
  • Sparkly Gingham Halter Crystal Thong Brazilian Swimsuit - Royal Blue / S On sale
    Oferta

    Traje de baño brasileño con tanga de cristal y cuello halter de cuadros vichy brillantes

    Traje de baño brasileño con tanga de cristal y cuello halter de cuadros vichy brillantes
    $38.18 $58.08
  • Sports Backless Boxer Conservative One Piece Swimsuit - On sale

    Traje de baño deportivo de una pieza conservador sin espalda Boxer

    Traje de baño deportivo de una pieza conservador sin espalda Boxer
    $77.99
What 'open-back' means

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

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

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

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.

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