A note from our founder, Lauren Yerkes, on the bikini tops, one-pieces and swim forms designed for women who wear a breast prosthesis — whether they wear one or two.
One of the questions we hear more than almost any other is some version of: "Will this actually hold my prosthesis in place?"
It makes sense. So many women come to us after a mastectomy — some who had a single mastectomy and wear one prosthesis, some who had a bilateral mastectomy and wear two, and some who move between wearing a prosthesis and going without, depending on the day. What they have in common is this: most swimwear was never built with a breast form in mind. Suits shift. Cups gape. Forms ride up the second you dive in or bend down to grab a towel, and suddenly you're adjusting yourself in front of everyone instead of just enjoying the water.
That's not a small thing. It's the difference between a day at the pool that feels easy and one that feels like a performance.
We didn't want that for our customers. So certain POST SWIM styles are built with real prosthesis pockets — not an afterthought stitched in, but part of the actual construction — so a form stays exactly where you put it. We also carry a swim-specific prosthesis from TruLife, because we think the suit and the form should be designed to work together, not just coexist.
Keep reading for the details on which styles hold a prosthesis, how they do it, and what we carry to go with them.
Xo, Lauren
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What It Means to Wear a Breast Prosthesis After Mastectomy
After a mastectomy, women land in different places. Some choose reconstruction. Some choose to go flat. And many choose to wear an external breast prosthesis — sometimes called a breast form — either occasionally or as part of their everyday routine. A woman who had a single mastectomy typically wears one prosthesis to restore balance and symmetry; a woman who had a bilateral mastectomy and remains flat may wear two.
None of these choices is more "recovered" than another. They're just different ways of moving through the world after surgery, and swimwear should support all of them.
The catch is that a regular swimsuit — even a nice one — usually has nowhere for a prosthesis to actually live. Without a pocket to hold it in place, a form can shift with every wave, every lap, every time you sit down on a lounge chair. Some women end up hand-sewing pockets into store-bought suits, or avoiding certain necklines and cuts altogether because they can't trust the fit.
POST SWIM's prosthesis-friendly styles are built with that problem in mind from the start. Each one includes internal pockets designed to hold a breast form securely against the body, so the suit moves the way you move — in the water, out of the water, and everywhere in between. For women who wear two prostheses, a center seam separates the two pockets, so each form stays in its own place instead of shifting toward the other as you move.
Meet TruLife: The Swim Form We Carry
Not every prosthesis is made for the water, which is part of why we carry the TruLife 630 Active Flow Swim Form directly on our site. It's a lightweight prosthesis designed specifically for swimming and water activities, with a water-flow design that lets water move through the form so it dries quickly instead of sitting heavy against your skin.
A few things worth knowing about it:
- Water-flow design lets water circulate through the form for faster drying between swims.
- Lightweight and comfortable, whether you're doing laps, lounging poolside, or in the middle of a water workout.
- Natural shape and contour for a balanced silhouette under your suit.
- Built specifically for POST SWIM's prosthesis pockets, so it pairs seamlessly with styles like The Kim and The Judy.
The TruLife 630 comes in sizes 5 through 9 in a nude colorway, priced at $75.
The Styles We Designed to Hold a Prosthesis
Every POST SWIM suit is named after a family member or close friend, and the styles below were built specifically to give a breast form somewhere secure to sit — whether you're wearing one prosthesis or two.
The Kim
Named after Lauren's sister, The Kim is a supportive, prosthesis-friendly bikini top.
- Why it holds a prosthesis: Built-in pockets keep a breast form securely in place, so you're not adjusting yourself mid-swim. A center seam separates the two pockets, so if you wear two prostheses, they stay put on their own sides instead of shifting toward each other as you move.
- Construction: Made with compression fabric and removable, waterproof cups, so you have the option to wear the cups alone, your prosthesis, or both.
- Coverage: A square-neck silhouette that works whether you're flat or reconstructed.
- Fit note: Runs small; we recommend sizing up one size.
- Price: $55
The Judy
Named after Lauren's paternal grandmother, The Judy is a supportive one-piece with a front zipper.
- Why it holds a prosthesis: Built with prosthesis support sewn directly into the construction, so a form stays put whether you had a single or bilateral mastectomy. A center seam keeps the two pockets separated, so if you wear two prostheses, they stay in place on their own sides rather than touching as you move.
- Front-zip design: The zipper makes the suit easier to get in and out of, especially useful if arm mobility is limited after surgery.
- Adjustable coverage: The zip also lets you adjust how much you show, so coverage is your call, not the suit's.
- Fit note: Runs small; we recommend sizing up one size.
- Price: $74
The Zoey
The Zoey is a bikini top that looks like a halter from the front — a high neckline, knotted at the center chest — but turn around and you'll find full coverage across the back, not just a couple of thin straps.
- Why it holds a prosthesis: Built-in pockets hold a prosthesis securely in place, so the fit stays put no matter what the day looks like — swimming, lounging, or chasing your kids around the shallow end. A center seam separates the two pockets, so if you wear two prostheses, they stay on their own sides instead of shifting toward each other as you move.
- Coverage: Full back coverage pairs with the clean, minimal look up front, so you get the shape you want with the support you actually need.
- No clinical feel: It reads as a fashion piece first — the prosthesis pockets are a quiet detail, not the headline.
- Price: $137
Find the Style That Feels Like You
Whether you wear one prosthesis or two, whether you wear one every day or only some days, these styles were designed to give you somewhere secure to put it — without sacrificing how the suit actually looks. A bikini top, a one-piece, or a swim form built specifically for the water: the goal is the same. You should be able to get in and enjoy it.
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Frequently Asked Questions About Prosthesis-Friendly Swimwear
What makes a swimsuit prosthesis-friendly?
Prosthesis-friendly swimwear includes built-in pockets or internal construction designed to hold a breast form securely against the body, so it doesn't shift, ride up, or need constant adjusting in the water.
Can I wear two prostheses in a POST SWIM suit?
Yes. Styles like The Kim, The Judy and The Zoey are built with pockets on both sides, so they work whether you wear one prosthesis after a single mastectomy or two after a bilateral mastectomy.
If I wear two prostheses, will they touch or shift toward each other?
In styles like The Kim, The Judy and The Zoey, a center seam separates the two prosthesis pockets, keeping each form in its own place. That means less shifting, bunching, or the two forms sliding toward the middle as you swim, bend, or move around.
What's the difference between flat-friendly and prosthesis-friendly?
Flat-friendly styles are designed to sit smoothly against a flat chest with no bra shelf or shaping. Prosthesis-friendly styles include internal pockets built to hold a breast form securely. Some styles, like The Kim, The Judy and The Lynn, are designed to do both — sit smoothly when worn flat, or hold a prosthesis when you want one.
Do you sell a prosthesis, or just the swimwear?
Both. We carry the TruLife 630 Active Flow Swim Form directly on our site — a lightweight, quick-drying prosthesis made specifically for swimming, designed to pair with our prosthesis-pocket styles.
Is it safe to swim while wearing a breast prosthesis?
A swim-specific prosthesis like the TruLife 630 is designed for water activities, including swimming. Combined with a style that has secure internal pockets, it's built to stay in place through normal swimming and pool or beach activity.
Do these styles run true to size?
The Kim and The Judy both run small, so we recommend sizing up one size. Check the fit note on each product page for details specific to that style.