I Tested 15 One-Piece Swimsuits—Here’s the Game-Changer Under $40 That Outsmarted Them All

Ever had that sinking feeling when you’re poolside or beach-bound and Aunt Flo decides to show up uninvited? Yeah, me too. We all know the anxiety of wondering, “Is this swimsuit going to betray me?” Well, what if I told you there’s a swimsuit designed not just to look stunning but to actually have your back when your period crashes the party? Imagine slipping into a sleek one-piece that hides a genius absorbent layer, holding up to three teaspoons of blood without a whisper of moisture or the need for a backup pad. Sounds like magic—or maybe just science doing what it should. Whether you want that extra period protection or prefer a classic style, this suit offers choices, coverage where you want it, and sizing that celebrates all bodies—all wrapped up in a fabric that’s soft, protective, and sun-savvy. If you’re tired of letting your cycle dictate your swim plans, this might just be your new secret weapon. LEARN MORE

If you’re on your period, you need a swimsuit you can count on to keep you feeling dry and worry-free (because let’s be real, we’ve all been there!). This one-piece offers light protection with a built-in absorbent layer that’s completely invisible in the gusset but can hold up to three teaspoons of blood. So if your tampon leaks, you’ve got a backup—no pad required. The best part? You won’t even feel the extra moisture—the suit absorbs it like magic.

If you’re not into moisture-absorbing gussets, you can go for the standard option without built-in protection. I like that the choice is there—you can get period protection if you need it, or just stick with the regular suit.

This suit is also great if you’re looking for more coverage. It’s high enough to keep cleavage in check and provides full coverage in the back. Plus, it runs true to size, and the adjustable shoulder straps make for a better fit. I find the sizing to be super inclusive—it goes all the way up to a 4X, so you can easily find the right size for you.

To top it off, the fabric has a UPF 50+ treatment—the highest sun protection rating for fabrics—so it adds an extra layer of defense against UV rays (though make sure you still apply SPF underneath!). And, the nylon and spandex mix adds a nice, soft layer so it doesn’t feel like performance fabric—it feels like you’re wearing a smoothing body suit.

Read More: Knix Period Swimwear Review