My Mense Period Underwear: How the Brand's Leak-Proof Basics Actually Work

If you are researching My Mense period underwear before you buy, you are probably weighing one question: does leak-proof underwear actually replace pads and tampons, or is it a comfortable backup layer? This guide breaks down how My Mense builds its underwear, which style fits which flow and life stage, what independent safety research says, and how to care for the garments so they last. We link to the brand where relevant so you can compare styles and check current availability. Explore My Mense period underwear

What is My Mense period underwear?

My Mense period underwear is a line of washable, reusable underwear built to absorb menstrual flow directly, without a separate pad, tampon, or cup. The company was founded by Dr. Regina Girgis, a physician, together with Isabelle Doczy, a registered healthcare and nursing professional, which shapes how the brand talks about fit, hygiene, and comfort across its product pages. The brand is a German/Austrian founder-led company, which is relevant if you are comparing sizing charts or shipping options from within the EU.

Functionally, period underwear like this sits in the same category as reusable pads and menstrual cups: a garment or product you wash and reuse cycle after cycle instead of throwing away. According to the Cleveland Clinic, period underwear is generally built from moisture-wicking microfiber layers with a waterproof barrier sewn between them, which is the basic engineering behind most brands in the category, including My Mense.

How the SafeLayer construction works

My Mense markets its absorbent core as SafeLayer, described on the brand's own pages as its proprietary absorbency technology used across the underwear range. In practice, this places My Mense in the same layered-construction family that the Cleveland Clinic describes for period underwear generally: a top layer against the skin, a moisture-wicking middle, and a leak-resistant barrier layer.

My Mense states its underwear absorbs up to roughly the equivalent of five tampons' worth of liquid, with protection intended to last up to 12 hours depending on flow and style — figures the brand publishes itself and that are not independently verified for this specific product. Independent research adds useful context here rather than confirming the brand's number: a study using actual menstrual blood (instead of saline, the older industry testing standard) found that period underwear as a category absorbed the least of the products tested, about 1 to 3 mL, compared with 20 to 34 mL for tampons and up to 80 mL for menstrual discs, and that some products on the market held more liquid than their advertised capacity. That study did not test My Mense specifically, so it neither confirms nor disproves the brand's figure — but it is a good reason to treat any period-underwear brand's absorbency claim, including the "five tampons' worth" figure, as unverified marketing language rather than settled fact.

Choosing your My Mense period underwear by situation

My Mense sells several cuts and absorbency levels, and the right pick depends on your flow, activity, and comfort preferences rather than one "best" option for everyone.

Heavy flow and overnight

If you regularly soak through a super tampon or overnight pad, look at the brand's higher-absorbency styles first. My Mense rates these styles at up to roughly five tampons' worth of capacity and up to 12 hours of protection — brand-stated figures rather than independently verified test results — so these are aimed at the days when leaks are your main worry, not just comfort. Many people pair heavy-flow underwear with a cup or tampon on the first one to two days, then rely on the underwear alone as flow tapers.

Teens and first periods

For a first period, period underwear removes the learning curve of applicators or cup insertion. My Mense's teen-oriented styles are designed to function like normal underwear, which can lower the intimidation factor for a first-time user while still offering absorbency built on the same SafeLayer approach as the adult range.

Swimming

Swim-specific period underwear needs to hold shape and absorb flow while wet, which is a different engineering problem than a dry-wear pair. If you are shopping for pool or beach days, check the product page specifically for a swim-rated style rather than assuming a standard pair will perform the same way in water.

Everyday, seamless, and lace styles

For light-to-moderate days, or as a backup layer under a tampon or cup, the seamless and lace-trim styles prioritize looking and feeling like ordinary underwear. These typically trade some absorbency capacity for a lower profile under fitted clothing, which is a reasonable trade-off if your main goal is discretion rather than maximum flow protection.

My Mense styles compared

Use this table to narrow down which category fits your main use case before you browse the full My Mense catalog.

Is period underwear safe? What the research says

Gynecologists and poison-control experts generally consider period underwear a safe menstrual product when it is worn and washed as directed. A scoping review of reusable menstrual product research similarly found that existing evidence suggests reusable options, including period underwear, are generally regarded as safe, though researchers noted that further research is still needed to establish actual complication rates.

That said, safety is a category-wide conversation, not a single-brand guarantee. GoodRx has reported that PFAS ("forever chemicals") have been detected in some period underwear products on the market, which is worth knowing before you buy from any brand. We have not seen independent, third-party lab testing confirming My Mense's PFAS status one way or the other, so if that is a priority for you, contact the brand directly for their current testing documentation before purchasing rather than assuming either outcome.

Care, washing, and how long My Mense underwear lasts

Reusable period underwear needs a consistent wash routine to stay absorbent and odor-free. The Cleveland Clinic recommends washing period underwear with a mild detergent, adding an extra rinse cycle to fully clear out any residue, and air-drying rather than using a hot dryer, which can degrade the absorbent layers over time.

Following a care routine like this is also what allows My Mense underwear to reach its stated reusable lifespan of 3+ years with proper care, rather than losing absorbency after a handful of cycles. A simple routine looks like this:

1. Rinse the garment in cold water immediately after wear to loosen flow before it sets.
2. Machine or hand wash with a mild detergent, avoiding fabric softener, which can coat and reduce the absorbent layer's performance.
3. Add an extra rinse cycle if your machine allows it, to fully clear detergent and residue.
4. Air-dry flat or on a line; skip the tumble dryer.
5. Rotate between at least 2-3 pairs so one is always clean and ready during your cycle.

Common mistakes to avoid

Most disappointing experiences with period underwear come down to a handful of avoidable mistakes rather than the product failing outright.

• Buying only one absorbency level. Pairing a heavy-flow style for your first two days with a lighter everyday style later in your cycle usually performs better than one style for the whole week.
• Using fabric softener or a hot dryer. Both can coat or damage the absorbent layers, shortening the underwear's usable life well below the 3+ year target.
• Skipping the pre-rinse. Letting flow dry into the fabric before washing makes stains and odor much harder to fully remove.
• Not sizing up for heavy days. A too-tight fit can reduce the surface area of the absorbent core actually in contact with your body.

Alternatives to consider

Period underwear is one option in a wider reusable-products category that also includes menstrual cups, discs, and cloth pads. Reusable products as a group generate far less waste over time than single-use pads and tampons, since one garment or cup replaces dozens of disposables across a year. If you want maximum internal capacity for very heavy days, a menstrual cup used alongside My Mense underwear as a backup layer is a common combination. If you are brand-new to reusables and want the lowest learning curve, starting with underwear alone (no insertion required) is usually the easier entry point.