Swimsuits That Fit Like Underwear^®: Top Customer Questions Answered

If you’ve ever wished your swimsuit felt as comfy as your favorite no-show underwear… same. That’s exactly why we created swim that fits like undies: a totally new kind of swimsuit designed to stay put, feel smooth, and move with you (without digging in, of course!). 

We get a lot of questions about how our ultra-flattering swimwear works, how it fits, and what makes it different, so we’re answering the most common ones right here.

How is swim that fits like underwear different from traditional swimwear?

Traditional swimwear is built with thick seams, tight elastic, and stiff edges that can dig, pinch, and squeeze your body. 

Our beyond-seamless swim is different. We took what we love about no-show undies: 

• smooth, raw-cut edges

• flexible stretch

• a fit that's totally one with your body

Then we made it swimmable with our patented swimsuit construction! It's still two layers of normal swimwear material, but they're bonded, not sewn with tight bulky seams that squeeze. The result? A second-skin, dig-free swimsuit that fits and feels like underwear. 

Is this considered “seamless swimwear”?

Nope! Our swimwear goes beyond seamless for a smooth fit that's completely edgeless on the body. 

The “seamless” swimsuits on the market still rely on thick seams and hidden elastic that can dig and squeeze. They're just flipped inside out, so you can't see them. 

onewith eliminates that squeezing feeling, with bonded construction that lays smooth against your body and stays comfortable all day.

That's why we say our swim is better than seamless, or even beyond seamless! 

How does it stay in place if it’s so comfortable?

Every edgeless swimsuit is lined with an inner grip strip at each opening. This inner grip strip keeps your comfy swimsuit secure, without the use of tight seams or elastic. 

That inner grip strip:

• holds the suit against your body

• prevents slipping, rolling, and shifting, in and out of the water

Because of the inner grip strip, you need to warm up your onewith before each wear! This is absolutely essential to achieving that dig-free, lay-flat look and feel we all love. At each side of the garment (but not directly on the seam), get a hearty grip, and stretch! It takes just 15 seconds for second-skin swim perfection. 

What size should I get?

Fit is everything with onewith! The biggest thing to know is: your suit should feel snug at first.

When you try on your proper onewith size, it will dig in a little to start. That's totally normal, and it's a green flag that you have the correct size! After you stretch your swimsuit that fits like undies, it should feel like a firm, snug hug on the body, without digging in.

If it feels loose right away or feels like your perfect fit without needing to be stretched, that's a tell-tale sign that it's too big (and extra room can cause gaping when wet).

Be sure to take the size quiz on every product page, read the fit notes, and check the "see it on" section for the full sizing run-down. 

Still not sure what size to get? Just let us know! We’re happy to help you find your perfect fit!

Do you offer returns or exchanges?

We do! Eligible orders must be: 

• within 14 days of carrier-confirmed delivery
• unworn/unwashed

• with tags still intact

Check out our full return policy here. 

Why don’t you have more colors?

We get this one all the time. Trust us, we want all the colors too! That said, onewith isn’t mass-produced traditional swim.

Size inclusivity is the most important pillar of our brand. Looking for a flattering swimsuit for plus size? A swimsuit that covers the lower belly? The most flattering mid-size bikini? We have it all! We'd rather release a size-inclusive swimsuit collection, than a swimsuit collection that has a lot of colors and patterns. 

TL;DR: More colors are absolutely on the way! We just produce mindfully, and size inclusivity will always come first.

If you want first access to new drops, make sure you’re on our email list or following along on IG!

Still have questions?

Swim that fits like underwear is unlike anything on the market, and once you find your perfect onewith fit, you won't want to wear anything else!

If you have questions about sizing, styles, or the most flattering swimsuit for you, our team is always here to help! Ready to make the switch and try our beyond seamless swim? Check out the onewith collection of swim that fits like no-show undies here.