• Bellows Plunge High-Cut One Piece
  • Bellows Plunge High-Cut One Piece
  • Bellows Plunge High-Cut One Piece
  • Bellows Plunge High-Cut One Piece
  • Bellows Plunge High-Cut One Piece
  • Bellows Plunge High-Cut One Piece
  • Bellows Plunge High-Cut One Piece
  • Bellows Plunge High-Cut One Piece
  • Bellows Plunge High-Cut One Piece
  • Bellows Plunge High-Cut One Piece
  • Bellows Plunge High-Cut One Piece
  • Bellows Plunge High-Cut One Piece
  • Bellows Plunge High-Cut One Piece
  • Bellows Plunge High-Cut One Piece
  • Bellows Plunge High-Cut One Piece
  • Bellows Plunge High-Cut One Piece
  • Bellows Plunge High-Cut One Piece
  • Bellows Plunge High-Cut One Piece
  • Bellows Plunge High-Cut One Piece
  • Bellows Plunge High-Cut One Piece

Bellows Plunge High-Cut One Piece

4.5
Rated 4.5 out of 5 stars
38 Reviews
Regular price $92.00
Unit price per
SWIM THAT FITS LIKE UNDIES™, as seen on Shark Tank! patent-pending.
Size
Color:
Added to Cart! View cart or continue shopping.
If you want an absolute dynamite, bombshell fit, Bellows is IT for you. A super secure, deep V neckline with removable cups combines with a high-cut...
hi 👋 we're onewith - the most flattering swimwear! our swimwear is patent-pending, dig-free, elastic-free, and edgeless, just like your favorite no-show seamless undies.

see it on 👀

size & fit info

Customers say this style runs true-to-size. All torso lengths welcome for this style, she really can suit anyone thanks to her high-cut leg and plunging neckline!

View our size chart here

when you get your onewith

you want your swim to feel snug right out of the package — that’s a good sign! your onewith swim actually should dig in a bit to start. then, after giving them a bit of a stretch, your suit will be second-skin perfection, just like no-show undies! see full info here.

shipping & returns

RETURNS

  • 1 free exchange for eligible US orders 🫶
  • 14-day returns available for a fee for eligible US orders 📦
  • items purchased at a discount of 30% or more are eligible for store credit only.
  • items marked final sale are always, you guessed it, final sale!
  • international orders are always final sale. see our full returns policy here.

SHIPPING

  • free standard shipping on US orders over $85 😍
  • priority + express shipping also available! 💨
  • international shipping available, rates and duties calculated at checkout ✈️
  • Shipping Protection, offered at checkout, is HIGHLY recommended! It covers lost, damaged, stolen, and stuck-in-transit packages 👍
product details
  • designed in USA, made in China
  • patent-pending
  • LATEX INFO: we cannot guarantee that the inner grip strip of our suits is entirely free of latex. If you have a latex sensitivity or allergy, we recommend exercising the same caution you would typically use when assessing whether to wear a product that may contain latex.
  • 80% nylon, 20% elastane
  • hand wash only, lay flat to dry
swimsuit care
  • Hand wash in cold water as soon as you can after use (rinsing in the shower is fine!)
  • DO NOT machine wash.
  • Lay flat to dry, do not hang.
  • Do not dry clean, iron, or machine dry (even on a delicate cycle...) as this can, and most likely will, damage your onewith.
  • Hot tubs and chlorinated pools with harsh chemicals can impact the quality and longevity of any swimwear, so it’s best to avoid them if you want to keep your swim in tip-top shape.
  • If you wear your onewith under normal clothes, keep in mind that friction can create pilling/snagging. We prefer to wear our onewith under beach cover-ups/sarongs, which are created to be worn with swim.
  • Sunless tanners, suntan lotions, oils, and harsh chemicals can ruin your onewith - ensure to not get these products in contact with any swim/garments!
  • ships from CT, USA
  • free shipping on US orders over $85
  • 14-day returns
  • 1 free exchange
as seen in

onewith you from the inside out ↔️

our swim has a soft inner grip strip to keep your suit secure...without tight seams.

free shipping on US orders over $85
size-inclusive (XXS - 4XL)
1 FREE exchange eligible on US orders

why choose onewith?

✨onewith ✨ vs. other swimwear

other swim brands
edgeless (no digging!)
no squeezing (elastic-free!)
no hidden seams inside
raw-cut (lays-flat on the body!)
inner grip inside to keep secure
made with 2 layers of fabric

☝️ frequently asked questions

the most commonly asked Qs about our SWIM THAT FITS LIKE UNDIES ⬇️
  • please take our size quiz! it's the pink button that says 'CLICK HERE to find your size.' that is on every single product page on our site.

    you only need to take it once, and your best size will automatically display for each product on our site, depending on how that product runs.

    if you still want help in finding your size, reference our size guide here

    additionally, chat us on-site (quickest!) or DM us on IG and we can help you out.

  • We offer 1 free exchange on eligible US orders so that you can find your best onewith size.

    Returns are available for a $12.50 fee per order (additional fee will apply if you're returning more than 3 items).

    US orders purchased at a discount of 30% or more are eligible for return for store credit ONLY. no refunds or exchanges.

    International orders are ALWAYS final sale.

    You may return/exchange your eligible order within 14 days, the 14-day window begins the day of carrier-confirmed delivery. 

    Read more about the onewith Return Policy here.

    ⚠️ NOTE: ITEMS MARKED FINAL SALE + MYSTERY BUNDLES ARE ABSOLUTELY, POSITIVELY FINAL SALE. No returns, no exchanges, no exceptions. 

  • onewith = 2 layers of normal swimwear fabric, just like any other swimwear. people tend to think our swim is either 1 layer of fabric, and/or super thin, like no-show undies. that is not true! again, our swim has 2 layers of fabric. It's just bonded together, not sewn with tight seams, which gives it a sleeker appearance that people may read as "thin." While we can't guarantee our suits are frontal-wedgie-free, so-to-speak as every person's anatomy is different, we can say that there is no reason why our suits would cause 🐪toe more than any other swimwear.

  • yes, all of our bikini tops + one pieces have removable bust cups that you can leave in, or take out!

  • we get it, the itch to get your swim that doesn't dig in ASAP is real! luckily, we do offer an Express shipping option if you do need it ASAP. otherwise, we offer free standard shipping on US orders over $85. all orders with standard shipping ship from our Connecticut, USA warehouse within 2-5 business days of receiving your order.

  • ALL onewith suits feature our inner grip strip, which keeps the suits secure without the use of tight seams or elastic that digs. the inner grip strip is super soft and flexible.

🥴 traditional swimwear vs. onewith swim✨

✨ what to know when your onewith arrives! ✨

onewith is designed to fit like your favorite seamless undies — and that starts with a little warm-up. 💫

you want your swim to feel snug right out of the package — that’s a good sign! your onewith swim actually should dig in a bit to start. then, after giving them a bit of a stretch, your suit will be second-skin perfection, just like no-show undies!

  • ☝️ your correct size SHOULD dig in a bit to start, then...

  • after warming up your onewith (aka giving it a stretch) ↔️

  • ✨your onewith will be smooth like no-show undies! 🫧

4.5
Rated 4.5 out of 5 stars
Based on 38 reviews
Total 5 star reviews: 26 Total 4 star reviews: 8 Total 3 star reviews: 2 Total 2 star reviews: 2 Total 1 star reviews: 0
89%would recommend these products
38 reviews
  • AB
    Alexa B.
    Verified Buyer
    Reviewing
    Bellows Plunge High-Cut One Piece
    I recommend this product
    Rated 5 out of 5 stars
    6 days ago
    Amazing!!

    I am 5 ft 3 inches and about 118 lbs. I ordered the medium which fits well. My chest is smaller so it’s a little bit bigger than I would like on top but it stays in place well. The quality is amazing!!!!

  • RC
    Randi C.
    Reviewing
    Bellows Plunge High-Cut One Piece
    I recommend this product
    What size bottoms do you normally purchase? M
    What size did you purchase? M
    Rated 5 out of 5 stars
    1 month ago
    LOVE MY BELLOW ONEWITH SWIMSUIT!!!

    I am a 62 year old woman who has 4 grown children. I had heard about OneWithSwim from several friends who raved about how amazing the swimsuits fit. Then my 24 year old daughter bought one and wore it at a family outing last week....she looked stunning!

    So I dared to order the Bellow one piece in size M. I could not believe my eyes when I tried on my new swimsuit...I haven't seen that figure in over 25 years! The swimsuit hit me in all the right places to accentuate my figure...especially my rear!!!! I just placed an order for 2 more in other colors!! I don't know how they do it ...but I now call this my "miracle" swimsuit! Thank you OneWithSwim‼️‼️

    How This Bikini Bottom Fit MeRated 0.0 on a scale of minus 2 to 2
    O Profile picture for onewith
    onewith
    3 weeks ago

    AHH! Thank you SO much for this amazing review, and for giving onewith a try, Randi! We're thrilled to hear you love your Bellows, and that your daughter loves her suit too! We can't wait for you to try your other colorways of your ultra-flattering one piece. Your support means the world to us! Enjoy your onewith :)

  • SR
    Scott R.
    Verified Buyer
    Reviewing
    Bellows Plunge High-Cut One Piece
    I recommend this product
    What is your age? 35-44
    What is your typical bra size? Other
    What size did you purchase? XL
    Rated 5 out of 5 stars
    2 months ago
    Classic and comfy

    Really lovely. I wanted something comfortable and classic with a high cut in the hips and a low back. Got what I wanted. I haven't swam in it yet, but I love this one piece and will buy the red one and keep my fingers crossed for more colors, which from the the creator says is not something we should get too excited about.

    How This One Piece Fit MeRated 0.0 on a scale of minus 2 to 2
    How This Bikini Top Fit MeRated 0.0 on a scale of minus 2 to 2
    O Profile picture for onewith
    onewith
    1 month ago

    Thank you so much for your review, Scott! We're absolutely thrilled to hear how much you love your Bellows Plunge High-Cut One Piece, and that it's the classic comfortable swimsuit fit you've been looking for! While we keep our color selections carefully curated, we truly appreciate your enthusiasm for additional colorways... be sure to stay tuned for future drops! Your happiness with your purchase means the world to us, and we can't wait for you to take your first swim in it! 🌊

  • DB
    Dana B.
    Verified Buyer
    Reviewing
    Bellows Plunge High-Cut One Piece
    I recommend this product
    What is your age? 55-64
    What is your typical bra size? 34C
    What size bottoms do you normally purchase? S
    What size did you purchase? S
    Rated 5 out of 5 stars
    4 months ago
    Great Shape and feel

    This suit is perfect and such high quality. Thanks for making a one piece for all body shapes, sizes and ages. It's sure to be my go to this season. XO

    How This One Piece Fit MeRated 0.0 on a scale of minus 2 to 2
    How This Bikini Top Fit MeRated 0.0 on a scale of minus 2 to 2
    O Profile picture for onewith
    onewith
    3 months ago

    Thank you so much for your incredible review, Dana! We're thrilled to hear that you love your Bellows! Creating swimwear that makes everyone feel amazing is exactly what we aim for, and we're so happy you're experiencing that firsthand. We can't wait for you to rock your onewith all Summer long! 🌊