Bellows Plunge High-Cut One Piece
designed to start snug — then soften into a smooth, no-dig, second-skin fit after a stretch
first impressions of our swim that fits like undies
See our swim in your size
trying on your onewith
What to know when your onewith arrives!
What to know when your onewith arrives!
designed to start snug — then soften into a smooth, no-dig, second-skin fit after a stretch
1. your correct size SHOULD dig in a bit to start, then...
2. after warming up your onewith (aka giving it a stretch)
3. your onewith will be smooth like no-show undies!
1 FREE exchange on eligible US orders
size inclusive (XXS-3XL)
patented, US Patent No. 12,357,039
more swim you'll love
traditional swimwear
vs. onewith swim
goodbye, tight seams and elastic. hello smooth, patented swim that fits like your favorite undies.
after
before
edgeless...better
than seamless!
dig-free + elastic free
lay-flat, second-skin fit
why choose onewith?
2 layers of fabric, smoothly bonded, not sewn with seams that squeeze.
- CJCharles J.Verified BuyerReviewingBellows Plunge High-Cut One PieceI recommend this productRated 5 out of 5 stars7 minutes agoperfect fit
ordered this for my wife and it was a perfect fit.
- BBethanyVerified BuyerReviewingBellows Plunge High-Cut One PieceI recommend this productRated 5 out of 5 stars1 week agoMAGIC!!
Onewith has CRACKED THE CODE ladies!!! I seriously never write reviews but I had to for this. Typical one pieces never do us ladies justice. I always leave the store feeling deflated when trying one pieces on. They always make me look like an Oompa Loompa or a squished sausage link.
I’m typically a medium upstairs and a large/X-Large downstairs. I ordered a Large. For reference I’m 5’4, 160lbs, lean more towards pear or hour glass shaped, wide hips. The girls are supported and lifted, lower belly is snatched, yet it is sooo comfortable and doesn’t dig in (after stretching and warming her up)! She is beauty, she is grace, she is MAGIC!!
- LMLauren M.Verified BuyerReviewingBellows Plunge High-Cut One PieceI recommend this productRated 5 out of 5 stars2 weeks ago10/10
This was the most comfortable swimmy I have ever worn! I normally order an XL to fit my chest, but ended up sizing down to a large and after I stretched it it fit perfectly! The bottoms DID ride up a bit but not near as bad as other swim suits I own. Will definitely be purchasing more from here <3
- BYBlakeley Y.Verified BuyerReviewingBellows Plunge High-Cut One PieceI recommend this productRated 5 out of 5 stars2 weeks agoLove
Super comfortable and a great fit
frequently asked questions
does that strip inside your suits contain latex?
onewith can not guarantee that the inner grip strip inside of our suits does not contain trace amounts of latex. Therefore, if you have a latex or adhesive sensitivity/allergy, we recommend you exercising the same caution and sensibilities you would take in general when determining whether or not to use or wear a product that may contain latex or adhesive, should you have a known issue with these substances.
what size am I?
where are your suits designed & made, and what kind of fabric is it?
we are a US-based company; our suits are designed in North America and made in China. all pieces are made of 80% nylon, 20% elastane.
are your suits see-through?
our suits are 2 layers of fabric just like any other swimwear...it's just bonded, not sewn with tight seams, so that it lays flat on your skin like your favorite no-show underwear. with that, onewith is the same opacity as all other swimwear. if you are sensitive to ANY sheerness when wet, as with ALL swim, opt for a darker color.
when are you restocking?
sign up for restock notifications on the product pages of the item you want, and be sure to follow us on Instagram for the latest & greatest of all things onewith!
are your suits thin? like, will they cause 🐫toe?
our suits are 2 layers of fabric just like any other swimwear; it's just bonded, not sewn with tight seams. so while it may appear to be thinner, it is actually the same thickness of material as most traditional swim. so if you're worried about a case of 🐫toe, while we can't guarantee our suits are frontal-wedgie-free, so-to-speak as every person's body is different...we can say that there is no reason why our suits would cause it more than any other swimwear. if you're ever worried about anything showing through, a general swim tip is to opt for a darker color or a suit in a pattern.
why don't you have more colors/styles?
we design by demand and data. if we get enough requests for something & it stands to reason it might do well, we might just make it! for new color requests, please watch this video for more info on why we don't make a lot of colors.
if I don't know my size, can I just order multiple sizes and return what doesn't work?
⛔ we strongly discourage bracketing (ordering multiple sizes or styles with the intention of returning what doesn't work) as well as high-quantity first orders. while we completely understand the desire to find your perfect fit, this practice creates real inventory challenges for us as a small business, and also compromises hygiene best practices.
we're big believers in conscious consumerism and encourage small, mindful first orders. once you've found your perfect size and your new favorite swim, we absolutely love it when you stock up — just please do so with the intention of keeping your order, not returning the extras. we know this kind of large-order flexibility may feel standard with bigger retailers, but we ask that you consider how bracketing and high-volume returns affect a small business, its customers, and the environment.
returns of 4 or more items per order will be subject to a $15.95 processing fee in addition to the standard return fee.
what size am I?
in general we are true-to-size. please reference our size guide here. also, TAKE THE SIZE QUIZ! it is so helpful, we made sure of it :)
what happens if my swimsuit doesn't fit? can I return/exchage?
we offer a 14-day return/exchange policy on all swimwear, beginning the day of carrier-confirmed delivery. a customer's first exchange is free to ensure you find your perfect onewith fit. returns for store credit are also free; returns for a refund incur a $12.95 fee (additional fees apply for high-volume returns). all returns and exchanges must come back in original, unworn condition with the hygiene liner intact. Read more about the onewith return policy here.
in general our suits run true-to-size, but be sure to take the size quiz linked on each product page. the quiz is tailored to each style, so you'll always get the most accurate recommendation.
⚠️ NOTE: ITEMS MARKED FINAL SALE + INTERNATIONAL ORDERS ARE ABSOLUTELY, POSITIVELY FINAL SALE. no returns, no exchanges, no exceptions.
i wear [this] bra size. what size top am i?
because we make swimwear that feels like underwear, our swim tends to be a great fit on so many bust sizes... from AA to J cup and beyond! check the product images to see our tops on a range of bust sizes. check out this blog post for a comprehensive guide on how to best pick your top size. pro-tip for choosing your onewith bikini top size: we don't size by cup! we'd recommend going with the same size top you would for a camisole.
Can I see a certain style on a body type similar to mine?
we offer lots of content of our swim on different bodies all over our site + socials! Namely, we have a onewith wearer gallery all of our product pages, our ‘plus size’, ‘try-ons’, ‘customers’, and fuller bust’ highlights on Instagram, the coverage/support meter on product pages,, size guide page, and more! we have so much content with lots of different representation.
do you ship internationally?
onewith is proud to offer international shipping!
all international sales are positively FINAL. no returns or exchanges are available for international orders.
shipping rate to your country is calculated at checkout, and is set by the carrier. in most cases, this rate also includes duties/customs! some exclusions may apply.
I placed an order and was charged, but can't find a confirmation
it's possible you only included a phone number for contact info when you placed your order. in this case, all order updates would be sent via text. if you're not able to find any order notifications via text, please check any other email addresses you have access to. if you're still not able to find the confirmation, please send an email to info@onewithswim.com and our team will be happy to assist you!
what's your return/exchange policy?
swim is an intimate garment, and therefore deeply personal. for that reason, we're happy to offer returns and exchanges on domestic, non-final sale orders — with a few conditions.
exchanges: onewith offers 1 free exchange on eligible US orders within 14 days of carrier-confirmed delivery.
returns: onewith offers returns on eligible US orders within 14 days of carrier-confirmed delivery. returns for store credit are free; returns for a refund are subject to a $14.95 fee. additional fees apply for high-volume returns (4+ items).. items purchased at a discount of 30% or more are eligible for store credit only. see our full return policy for details.
final sale: items marked final sale and all international orders are final sale — no returns, no exchanges, no exceptions.
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