If you’re reading this Knix period underwear review, you probably know there’s nothing quite like being fast asleep, fully engulfed in sweet slumber, only to be awakened by the floodgates of a heavy period. When I went off birth control during a perpetually single stage in my mid-20s, I became all too familiar with springing awake at 6 a.m. and being met with something akin to an ’80s slasher film once I reached the bathroom. Nature works in mysterious ways, and like clockwork (at the crack of dawn, no less), my uterus would wake up and choose violence—ruining my REM cycle (and my sheets) in the process.
One might think that after 10+ years of having a menstrual cycle surprise stains wouldn’t be an issue, but anyone with a period knows the crimson tide is far from predictable. Practically out of nowhere, my fairly manageable flow decided to throw me a curveball and ramp things up again, triggering flashbacks of super-heavy preteen days when the idea of standing up in class sent me into a panic.
Stained sheets and ruined undergarments are just the tip of the iceberg. Despite what’s on the agenda, misfortunes abound when your flow has other plans, especially if a workout is involved. Few things are as nerve-racking as going into a Down Dog on Day Two of your cycle; the fear of a leak lingers in your mind, no matter how zen the yoga class is.
I’d known about period underwear since NYC subway stations were plastered with a trendy ad campaign circa 2015, but I never got around to trying them until I was researching for a roundup on the best period panties. Reviewer after reviewer praised the innovative garment for providing a solution to a lifelong problem most women can relate to—so I decided to give them a go.
I was signed up for an outdoor dance cardio class on a hot, mid-summer morning, and it happened to be a particularly heavy day. I decided to try the Knix Leakproof Thong for added protection, and aside from shielding my brand new bike shorts from a hard-to-fix stain, it gave me a newfound peace of mind to focus on movement and stop obsessing over dreaded leakage—with the bonus of having no panty line in sight.
I was immediately hooked. Knix’s absorbent underwear provides backup protection by holding up to one tampon of liquid (or up to six if you go with the Super Leakproof Thong), which is a major game-changer when I’m on the move. And if I’m going to sleep, the Knix Leakproof Bikini Panties (or the Knixy Lace Essential High Rise if I’m feeling cute), are my best friend. I’m finally able to stop rising with the roosters and put my go-to stain remover on sabbatical.
Oh, and if you’re worried about feeling like you’re wearing a diaper, rest assured the seamless, lightweight design is far from it. They honestly feel like regular seamless panties except for the quick-dry, anti-odor gusset, which saves the day when leaks attempt to kill the vibe. Don’t get me wrong—I’m not trying to demonize a perfectly natural bodily function, but I personally am not here for freely bleeding (and neither are my favorite jeans)—so these life-changing undies are here to stay. One of my absolute favorite things about them? They’re totally easy to clean—which I wasn’t expecting at all. The only thing you have to do is wring them out under the faucet then throw them in the wash with the rest of your laundry. Simple as that.
If you’re ready to see the light, shop some bestselling Knix options below, or if you want more information beyond this Knix underwear review, check out my roundup of the best period underwear for deets on other leading brands in the space.