when you get your onewith
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!
what It SHOULD LOOK LIKE
it should still dig in a little at first, like this! squeezing a bit to start = a sign that it is your proper size!
proper size before stretching
proper size while stretching
proper size after stretching
proper size after stretching
this is what you DON'T want your onewith to look like
swimwear that is truly too small
before stretching swim that is truly too small
stretching swim that is truly too small
after stretching swim that is truly too small
after stretching swim that is truly too small
swimwear that is simply too big
before stretching swim that is simply too big
stretching swim that is simply too big
after stretching swim that is simply too big
after stretching swim that is simply too big
still unsure about onewith sizing?
feel free to reach out to us at: info@onewithswim.com
1 FREE exchange on eligible US orders
size inclusive (XXS-3XL)
patented, US Patent No. 12,357,039
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 other adhesive, should you have a known issue with these substances.
what size am I?
In general we are true-to-size. But please reference our size guide here. Each product page features a fit note to help you choose your best size for that particular style if you find yourself in-between sizes 😊
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. Our lead partner factory is female-founded, Sedex certified, and SGS ISO:14001 system certified. All pieces are made of 80% nylon, 20% elastane, and we use fabric with recycled content as we can per supply chain availability.
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. onewith is no more see-through than other swimwear. If you are sensitive to sheerness, as with all swim, opt for a darker color.
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 have a thinner appearance, it is the same amount of material as most standard suits. 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.
what happens if my swimsuit doesn't fit? can I return/exchange?
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 — so take the guesswork out of finding 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 of 4+ items). items purchased at a discount of 30% or more are eligible for store credit only. all returns and exchanges must come back in original, unworn condition with the hygiene liner intact.
⚠️ NOTE: items marked final sale and all international orders are final sale — no returns, no exchanges, no exceptions.
read more about the onewith return policy here.
if I don't know my size, can I just order multiple sizes and return what doesn't work?
⛔ bracketing + high-quantity first orders are discouraged: while we understand the desire to find your best size and style, ordering multiple variants with the intention of returning what doesn't work creates inventory challenges for us as a small business and compromises hygiene best practices. we encourage conscious consumerism — start small and mindful, and once you've found your perfect fit, stock up! please note that returns of 4 or more items are subject to an additional processing fee.
when are you restocking?
We post launch and restock dates as soon as we can, be sure to follow us on Instagram for the latest & greatest of all things onewith!
do you ship internationally?
onewith is proud to offer international shipping!
please note that all international orders are final sale — no returns or exchanges available.
shipping rates are calculated at checkout and determined by the carrier. in most cases, this rate also includes duties and customs! ☺️