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

フラウンスフリルカットアウトワンショルダーワンピース水着

フラウンスフリルカットアウトワンショルダーワンピース水着

$37.65
シャーリングカットアウトスクランチオープンバックワンピース水着

シャーリングカットアウトスクランチオープンバックワンピース水着

$34.09
キラキラフリンジサロンローバックワンピース水着

キラキラフリンジサロンローバックワンピース水着

$29.99
スカラップハイネックレースローバックワンピース水着

スカラップハイネックレースローバックワンピース水着

$52.99
おなかコントロール水着ワンピースフリルモノキニ

おなかコントロール水着ワンピースフリルモノキニ

|15 レビュー

$33.99
ホルターネックプッシュアップハイウエストワンピース水着

ホルターネックプッシュアップハイウエストワンピース水着

|45 レビュー

$27.99
セクシーなプリント V ネックバックレスワンピース水着

セクシーなプリント V ネックバックレスワンピース水着

|43 レビュー

$32.99
フラウンスオフショルダー水着フリルワンピース水着

フラウンスオフショルダー水着フリルワンピース水着

|49 レビュー

$33.99
セクシーなワンショルダーフリルプリント花柄ワンピース水着

セクシーなワンショルダーフリルプリント花柄ワンピース水着

|43 レビュー

$37.99
フローラルショルダーストラップバックレスワンピース水着モノキニ

フローラルショルダーストラップバックレスワンピース水着モノキニ

|45 レビュー

$38.99
セクシーなオフショルダーフリルプリントフローラルワンピース水着

セクシーなオフショルダーフリルプリントフローラルワンピース水着

|45 レビュー

$33.99
セクシーなディープ V ネックバックレスブラジリアンワンピース水着

セクシーなディープ V ネックバックレスブラジリアンワンピース水着

|45 レビュー

$30.99
レオパードホルターハイウエストカットアウトワンピース水着

レオパードホルターハイウエストカットアウトワンピース水着

|37 レビュー

$38.99
クロスローバックディープVネックワンピース水着

クロスローバックディープVネックワンピース水着

$29.77
コントラストカラーVネックラッシュガードワンピース水着

コントラストカラーVネックラッシュガードワンピース水着

$27.99
クロス編みバックレスストラップモノキニワンピース水着

クロス編みバックレスストラップモノキニワンピース水着

|8 レビュー

$32.99
ソリッドカラーのセクシーなハイレグカットワンピース水着

ソリッドカラーのセクシーなハイレグカットワンピース水着

|3 レビュー

$39.99

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.