The best way to dry period underwear is to hang them in open air with good airflow, letting the multi-layer gusset dry completely before storing or wearing them again. Most brands recommend air drying because high heat can damage the waterproof lining and moisture-wicking layers that make period underwear work. But air drying isn’t always simple, especially in humid or cold climates where the thick absorbent layers can stay damp for a full day or longer.
Why Heat Is the Main Risk
Period underwear isn’t built like regular underwear. The gusset contains multiple layers: a moisture-wicking top layer, an absorbent core, and a waterproof backing that prevents leaks. High heat from a standard dryer cycle can break down the waterproof membrane over time, causing leaks that make the underwear useless. It can also warp the elastic and degrade the absorbent fibers. Some brands, like Lilova, advise against any machine drying at all. Others allow tumble drying on low or no heat.
That said, heat damage is cumulative, not instant. Wirecutter’s long-term testing found that some brands (Bambody in particular) held up for three or more years of machine washing and even high-heat drying, despite care labels saying otherwise. So one accidental dryer cycle won’t ruin your pair, but making it a habit will shorten their lifespan.
How to Air Dry Effectively
Hang the underwear open and flat rather than folded over a line, so air reaches the gusset from both sides. A skirt hanger or clip hanger works well for this. If you drape them over a drying rack, flip them partway through so the thickest part of the gusset doesn’t stay trapped against the bar.
Airflow matters more than temperature. A pair hanging in a still, humid bathroom can take well over 24 hours to dry, while the same pair in front of a fan can be ready in a few hours. Position a fan to blow directly on the hanging underwear if you want to speed things up significantly. In cold or damp climates, hanging them near your home’s heat source (a radiator, heating vent, or space heater at a safe distance) also helps.
Speeding Up Drying in Tough Conditions
If you live somewhere humid, don’t have outdoor drying space, or just need your underwear ready faster, a few techniques can cut your drying time considerably.
Start by pressing out excess water right after washing. Roll the underwear tightly inside a dry towel (a microfiber towel works especially well) and press down firmly on the roll. Don’t wring or twist the underwear, which can stretch the fabric and damage the internal layers. This towel-press method pulls a surprising amount of moisture out before you even start air drying.
A dehumidifier is another effective option, particularly in a small enclosed space. Place a folding drying rack in front of an electric dehumidifier and let the dry air blow across the underwear. The smaller the room, the faster this works, since the dehumidifier has less air volume to process. Some people even create a tent-like enclosure around the rack to concentrate the dry air.
Plug-in heated drying racks are also an option, but don’t place the underwear directly on the heated bars. Lay a thin towel or tea towel over the bars first to buffer the heat and protect the waterproof layer.
Using a Dryer on No Heat or Low Heat
If air drying truly isn’t practical, many people successfully use their dryer’s air-dry or tumble-dry-low setting. The key is no heat or minimal heat. Place the underwear in a mesh garment bag to reduce friction and tumbling stress, and run it alone or with other lightweight items rather than heavy jeans or towels that will batter it around.
Check the care label for your specific brand. Some explicitly allow low-heat tumble drying while others don’t. When in doubt, the no-heat air-fluff cycle is the safest machine option.
Avoiding Fabric Softener and Dryer Sheets
This applies to both washing and drying, but it’s worth emphasizing: never use fabric softener or dryer sheets with period underwear. Fabric softeners work by coating fibers with oils and other ingredients that make them feel soft and reduce static. That same coating leaves a water-repelling residue on the absorbent layers, making them less effective at pulling moisture away from your body. Over time, the residue also deteriorates the waterproof backing. If you’ve noticed your period underwear becoming less absorbent, past fabric softener use is one of the most common culprits.
Preventing Musty Odors
The longer period underwear sits damp, the more opportunity bacteria and mildew have to develop that stale, musty smell. The goal is to get them fully dry within about 24 hours. If your environment makes that difficult, combine techniques: towel-press first, then hang in front of a fan or dehumidifier. Touching the gusset is the easiest way to check. If any part of the multi-layer section still feels cool or clammy, it’s not done.
If your underwear does develop a lingering odor despite being clean, it usually means moisture got trapped during storage or the pair wasn’t fully dry when you put it away. A re-wash in cold water with a splash of white vinegar (no soap) followed by thorough drying typically clears it up.
Owning Enough Pairs to Rotate
The most practical solution to slow drying times is simply having enough pairs to rotate. If air drying takes 12 to 24 hours in your home, owning at least four to five pairs for your cycle means you’re never waiting on a damp pair. Some brands dry noticeably faster than others. Wirecutter’s testing noted that Goat Union pairs, for instance, took longer to dry than Bambody pairs whether air-dried or tumble-dried, so drying speed is worth considering when you’re choosing a brand.