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As someone with endometriosis (a disorder that causes heavy bleeding and severe pain during periods), I was interested in testing Knix’s period underwear, which is known for its leakproof technology. I live for hot yoga, running, and hiking, so managing menstruation with endometriosis has felt like my personal Olympic event for the last decade. Tampons? Nope—my body said, “Try again.” Menstrual cups? Let’s just say it’s a hard pass. And pads? Bulky, uncomfortable, and completely unreliable when you’re trying to hit Warrior II. Enter Knix underwear.
If you’re someone who’s also building an endometriosis-friendly wardrobe, read on for my full Knix period underwear review, below.
How I tested Knix period underwear
I practice yoga sculpt (in fact, I just completed my teacher training!), regularly go on runs, and hike. During these activities I wore two of the cotton underwear styles: Leakproof Cotton Bikini and Leakproof Cotton Boybrief. The absorbency options range from light to super heavy, with inclusive sizing from XS to XXXXL. I wore size small with moderate absorbency. (FYI: The brand claims that the underwear can hold up to 1 to 17 teaspoons of liquid, which is equivalent to 1 to 14 regular tampons.)
How the Knix period underwear feels
Original image by Glamour commerce producer Leilani McQuay
Original image by Glamour commerce producer Leilani McQuay
Admittedly, I was hesitant at first, wondering if I’d feel like I was sitting in wetness all day—but that couldn’t have been further from the truth. The material kept me feeling dry and comfortable throughout the day and cleaning is simple and convenient—just rinse, toss in the wash, and they’re ready to go. It’s the perfect fit for someone who refuses to let their period hold them back from an active lifestyle.
At five foot four and 105 pounds, I initially found the size small to be a little loose. But then my period arrived (along with its sidekick, Bloatzilla), and suddenly, the fit was perfect. I could twist, stretch, and run without feeling like I was wearing a diaper. The high-waist design and breathable fabric were everything I didn’t know I needed—no digging in, no awkward adjusting mid-run, just pure comfort and protection that let me focus on my flow (the yoga kind, not the other kind).
Knix’s No-Show Thong
Now let’s talk about a plot twist I didn’t see coming: thongs during your period. Yes, really. By day four or five, when things weren’t so heavy, I decided to give the Knix thong a try. To say I was skeptical is an understatement—I genuinely thought my thong days on my period were over. But there I was, rocking my jeans with zero leaks, no worries, and full comfort and confidence. It felt empowering to reclaim that option.
Original image by Glamour commerce producer Leilani McQuay
Final thoughts
What makes Knix even more impressive is the versatility of their product range. Whether you’re dealing with light spotting or the full Niagara Falls of periods, they’ve got you covered. They even offer high-waist styles for added comfort and multiple colors to match your mood—lace included—because, yes, period underwear can be both cute and functional. If your body can’t deal with tampons, menstrual cups, or pads, then Knix’s period underwear is worth trying.
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