NEW & IMPROVED FIT AS OF AUGUST 2024! we heard ya! you all wanted a more fitted, truer-to-size Penfield. so we did just that; meet the new Penfield High Waist Thong Bikini Bottom; the same exact cut & shaping; just nipped and tucked to get the fit closer to the body ☺️ we think you're gonna love this improved, no-show thong bikini bottom fit 🍑

A dipped high-waist front with a Brazilian-cut back. It’s almost *too* good, and really hits our ‘swimsuits that feel like underwear’ concept home. onewith’s inner grip tape at the top edge and along the legline holds Penfield in place, while our elastic-free and better-than-seamless swimwear bonding ensures that nothing pinches or squeezes, for totally dig-free swimwear look that is beyonddd cheeky.   

• Garment imported from China
• Designed in USA, patent-pending
•  Soft, flexible inner grip strip to keep the suit secure
•  LATEX INFORMATION: we 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 sensitivity or 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.
•  Dig-free, elastic-free, edgeless smoothing laser-cut construction, just like your fave undies
•  80% nylon 20% elastane
•  Hand wash only (rinsing in the shower is just fine), lay flat to dry

Ready to find your perfect onewith fit? Just click the size quiz button on any product page, answer a few simple questions. Once completed, your best size will populate, tailored to each and every style on our site for all our products as you continue to shop. 🎉

Now, remember—everyone's unique, and preferences, along with the human body, are more dynamic than any size chart or quiz could ever capture. That being said, our sizing quiz is the next best thing to actually trying on our suits in person 😉🔍 

Disclaimer: While we strive to provide the most accurate sizing guidance possible, please note that individual fit preferences and proportions may (read: WILL) vary. Buying the size that the size quiz suggests does not guarantee your fit.

If you have any further questions or concerns, our dedicated customer support team is always here to assist you (chat us, DM us, email us, etc!) and, we offer 1 free courtesy exchange on eligible orders 🩵 read our full return/exchange policy here.

Bellows One Piece Torso Measurements

When sized and stretched properly, onewith will NOT dig in. Remember: you're a human being, and bodies are so much more dynamic than just numbers on a size chart. DM us if you want further guidance on best size!

NOTE: Do NOT expect our suits to be IDENTICAL to no-show underwear in fit. Do note that our suits do not have the same amount of stretchiness of standard no-show panty due to the inner grip strip & bonding.

Looking for cup sizes? We don't size by cup! Go with the measurement of the fullest part of your bust, and reference the Bust section of the chart. Or, shortcut alert 📣 order the same size you would for a camisole/tight tank!

"can I just order a few sizes and styles and return what doesn't fit???"

please don't 🫠🫠🫠🫠 read about high volume returns here. (hint: we charge additional return fees for this! it's not great for our small business, the environment, and other customers ☹️)

Some IRL size reference pics for you: