Look for a sewn-in powernet panel, not just stretchy fabric.

Stretchy fabric alone won’t hold anything in once you hit the water. You need a built-in panel with powernet (a firm, mesh-like material) that’s actually sewn into the suit. It’s the difference between a bathing suit and shapewear that happens to be swim-safe.

Most suits that promise “tummy control” are just using thicker lycra, which flattens about as well as a wet t-shirt. A legit powernet panel will feel like a light girdle when you put it on. Look for descriptions that say “powernet lining” or “control panel” in the construction, not just “slimming fabric.” Brands like Lands’ End, Miraclesuit, and some Spanx swimwear do this right. Try them on and do a squat test in the dressing room—if the panel shifts or rolls, it’s not sewn in properly.

Ruching or shirring along the tummy area also helps disguise lumps by creating gentle gathers, but that’s a bonus, not the main trick.

The right panel won’t make you look like a sausage, but it will make you feel more confident. Worth the extra few bucks.