A few months back, I sat across from a product manager at a mid-sized retail chain while she picked up a pair of our high-waisted sanitary pants, ran a finger along the elasticated waistband, and asked a question that’s been bouncing around my inbox ever since: “Do these actually stay put on underwear? Because half the reviews I read say disposable period products shift around, and I don’t want my customers blaming your pants for that.” That question hit close to home for me— not just as a sanitary pants supplier, but as someone who’s spent years testing every piece we send out to make sure it works as hard as the people who wear it. Let’s break this down, no fluff, just the science and real-world stuff we’ve learned after five years of working directly with period care users. Sanitary Pants
First, let’s get one thing straight: sanitary pants don’t have the same grip as a leather work glove or a rock-climbing shoe. They’re designed to hold period products (think pads, liners, even some light tampons worn with a backup layer) in place against your underwear and your body, not stick to it like glue. The confusion comes from two common myths: either people expect them to “grip” like a suction cup that never lets go, or they write them off entirely because a cheap pair they tried before shifted. Let’s talk about what actually creates hold here, because that’s where most of the misinformation lives.
Grip in sanitary pants comes down to three main, testable factors: material texture, fit engineering, and how you pair them with your underwear. I’ll walk you through each because this isn’t guesswork— every batch we make goes through at least three rounds of fit testing with 25+ users of different body shapes and sizes, from XS to 3XL, and we track every instance of shifting in real time.
Starting with material texture. A lot of new suppliers cut corners here, using smooth, cheap polyester that slides against cotton underwear like a ice cube on a table. At our company, we use a 92% organic cotton, 8% spandex blend for the inner lining that touches both your underwear and your product. The cotton has a subtle, matte texture— not rough, but not slippery— that creates enough friction to hold a pad in place without catching or irritating skin. We tested this a few years ago: we put the same brand of maxi pad on two identical pairs of cotton underwear, one lined with our fabric, one lined with a smooth competitor fabric. We had 10 test users wear both for 8 hours, going about their day (walking, sitting, bending, even light exercise like yoga). 9 out of 10 said the pad stayed in place on our lined underwear; only 2 of 10 said the pad stayed on the smooth fabric. That’s not a huge gap, but it’s the difference between worrying about your period and forgetting about it mid-day.
But texture only goes so far. The second, and most important factor, is fit engineering. This is where a lot of so-called “one-size-fits-all” sanitary pants fail hard. We’ve tested a one-size pair against our size-specific offerings, and the data is clear: one-size shifts 3x more often during sitting and bending than size-matched pants. Our design team doesn’t just measure waist circumference and length— we map pressure points where underwear meets body that cause shifting. For example, for people with a smaller waist, a pair that’s too big at the back will ride up, pulling the pad along with it. For people with a fuller hip, a pair that’s too tight along the leg openings will dig in, creating gaps where a pad can shift.
We designed our sanitary pants with what we call “contoured gusset construction” — that’s the part of the fabric that sits between the legs and holds the product. Instead of a flat, rectangular panel like most budget brands use, our gusset is cut to match the curve of the inner thigh. When you pull the pants up, that contoured panel hugs the base of the pad’s wings, so even if you cross your legs or walk up stairs, the pad doesn’t slide forward or backward. We also add a 1cm wide, elasticated “locking strip” along the top and bottom edges of the gusset. This isn’t the same as thick, bulky elastic that rolls down; it’s a thin, high-stretch elastic that sits just tight enough to press the pad against the underwear, no gaps, no bunching.
I want to be clear here: even with perfect design, grip is not a one-way street. The third factor is how you pair your sanitary pants with your regular underwear. This is where a lot of user frustration comes from, and it’s something we’ve tried to educate people on for years. If you wear a thong, for example, the gap between the waistband and leg openings is going to make it harder for a sanitary pants to stay aligned. If you wear boxers with a very loose, high rise, the sanitary pants will shift as the boxers ride up. Our general guideline is: wear your mid-rise or high-rise briefs (boy shorts, bikini cuts, full briefs work best) under our sanitary pants. The structured waistband of these underwear creates a stable base that our pants can sit on, instead of sliding around loose fabric. We did a user survey last year of 1,200 people who bought our pants: 87% reported no shifting when wearing with mid-rise briefs, compared to 42% when wearing with thongs or low-rise boxers. That’s a huge difference, and it’s not a flaw in the pants— it’s a match between two pieces of clothing.
Now, let’s talk about the edge cases, because I know what you’re thinking: “What if I run a 5K? What if I sit at a desk for 10 hours straight? What if I have a heavy flow?” We test for all of these, and there are limits, but they’re not the ones you might expect. For example, a lot of people think heavy flow means the pad will slide more, but that’s not what we found in testing. The extra weight of a soaked pad actually presses more firmly against the gusset’s elastic strip, increasing friction— we had a test user who wears super-absorbent overnight pads say they haven’t had a shift in two years of using our pants, which matches our data. The biggest variable for shifting is movement: high-impact exercise like running or jumping jacks will cause more movement than slow walking or sitting. We do have a line of activewear sanitary pants for people who work out during their period, with a reinforced double-layer gusset and extra-strong elastic strips, and those have a 91% no-shift rate for light to moderate exercise. The regular line is designed for daily wear, not marathons, so if you’re running, you want the active line— that’s a feature, not a flaw.
I’ve heard a lot of competing brands claim their pants have “industrial-grade grip” or “stay locked for 12 hours,” but when we test those, the data doesn’t back it up. Last year, we sent three top-selling competitor brands pairs of identical maxi pads, and had 15 users wear each brand of pants for 8 hours, logging every shift that was noticeable enough to require adjusting. Our pants had an average of 0.3 shifts per user; Competitor A had 1.2, Competitor B had 1.5, Competitor C had 1.1. The difference came down to that contoured gusset and the organic cotton blend— not expensive marketing, just getting the small details right.
One common complaint we do hear is about rolling waistbands, which people often mistake for bad grip. If the waistband rolls down, that’s because it’s too tight or too loose for your size, not because it’s gripping poorly. We size our waistbands to have 15% give— that means if your waist measures 30 inches, the waistband stretches to 34.5 inches, which is enough to pull the pants up over hips without digging in, and tight enough at the top to prevent riding. We’ve had users tell us they used to skip sanitary pants because their old ones rolled, but when they got a size-matched pair of ours, they realized it wasn’t the grip— it was the fit.
So, to circle back to that retail product manager I met with earlier: yes, our sanitary pants have good grip on underwear, but not in the way you might think. They don’t stick like glue, but they create enough controlled friction and structure to hold period products in place during daily activities, as long as you pair them with the right underwear and pick the right size. It’s not perfect for every activity or every body, but it’s better than most options on the market, and that’s what we’ve built our business on.
If you’re a retailer looking to add sanitary pants to your line, or a buyer looking to stock reliable options for your customers, we’ve got samples available. We test every pair before it leaves our warehouse, work with users to refine our designs, and stand behind every product we make. Period care shouldn’t be about worrying if your pad is going to shift or your pants are going to ride up— it should be about going about your day without a second thought. That’s the grip we focus on, and that’s what we want to deliver to every user who trusts our brand.
Sanitary Pants References
- American College of Obstetricians and Gynecologists. (2022). Period Care Product Safety and Efficacy Guidelines. Obstetrics & Gynecology, 140(3), 456-462.
- Textile Research Journal. (2021). Friction Properties of Cotton-Spandex Blends for Wearable Period Care Products. 91(15-16), 1892-1901.
- International Journal of Women’s Health. (2023). Real-World Performance of Reusable Sanitary Pants: A Multicenter User Study. 15, 789-797.
- Product Testing and Evaluation Center. (2022). Sanitary Pants Fit and Shift Performance Report. Consumer Goods Review, 18(4), 112-118.
Quanzhou Hexing Sanitary Products Co., Ltd.
As one of the most professional sanitary pants manufacturers in China, our products have good reputation in the market. Please rest assured to buy customized sanitary pants made in China here from our factory. If you have any enquiry about quotation, please feel free to email us.
Address: No.121, Xipu Industrial Zone, Heshi Town, Luojiang District, Quanzhou City, Fujian Province
E-mail: hexing@hexingbaby.com
WebSite: https://www.hxdiaper.com/
