Noticing an unpleasant odour from your period underwear? You’re not alone and you’re not doing anything wrong.
Reusable period underwear is a smart, sustainable swap: comfortable, eco-friendly, and often more effective than disposables. But when odour becomes an issue, it’s usually linked to two key factors: care routines and fabric composition.
At Revol Cares, we design high-performance period underwear made with natural, breathable fabrics including organic cotton and bamboo. Our products are made to support heavy flows without trapping moisture or odour. Understanding how to properly care for them (and why fabric matters) can help ensure they stay fresh, wear after wear!
Should Period Underwear Smell?
In general: no. When washed and dried properly, period underwear should not develop strong or persistent odours.
A subtle metallic scent may occasionally be noticeable due to the iron content in blood, which is completely normal. But more intense odours like musty or sour smells. are typically a sign of trapped moisture, bacteria, or residue left behind in the fabric.
Fabric Matters: Why Natural Is Better
Many period underwear brands use synthetic fabrics like polyester and nylon, which can trap heat and moisture in the absorbent layers (definitely not something you want to happen with your undies)! That environment encourages bacterial growth, and with it, unwanted odours.
At Revol Cares, we choose natural, breathable fabrics, including bamboo, which is naturally antimicrobial so it actually resists odour-causing bacteria! Choosing undies made with breathable fabrics allows for better airflow, and helps keep you feeling fresher throughout the day.
Common Causes of Odour (and How to Prevent Them)
Even with high-quality natural fabrics, proper care is essential. Here are the most common causes of odour—and what to do about them:
1. Inadequate Rinsing
The first step after wearing your period underwear is to gently rinse in the sink with mid soap or dish soap. Skipping the rinse can allow blood/fluid to remain deep in the absorbent layers, particularly if the underwear is made from non-breathable fabrics.
Why it happens: Blood and other fluids not properly rinsed out can feed bacteria, even after a machine wash.
What to do: Rinse thoroughly with cold water and mild soap or dish soap immediately after use—until the water runs clear. This helps remove most residue before laundering.
2. Incomplete Washing
Quick or delicate machine cycles often aren’t enough to fully clean absorbent period underwear—especially if the underwear includes multiple layers.
Why it happens: Residual fluid or detergent can remain in the fabric, causing odour over time.
What to do:
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Wash on a long, cold cycle (max 30°C)
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Use a high-quality detergent—enzyme-based or bio detergents work well
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For deeper cleans, consider an oxi-based booster or a vinegar rinse
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Avoid fabric softeners, which can coat the fibres and trap odour-causing residue
3. Improper Drying
Dampness left in the fabric is one of the most common causes of a musty or mildewy scent.
Why it happens: Without sufficient airflow, natural fibres may stay damp for longer—especially when dried flat or in a pile.
What to do:
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Hang to dry in a well-ventilated area
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Turn inside out to speed up drying
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You can also tumble dry on low heat, which ensures all moisture is removed without damaging the absorbent core
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Always make sure they are completely dry before storing
Revol Cares: How to Properly Care for Your Period Underwear
To keep your Revol Cares underwear fresh, odour-free, and long-lasting, we recommend the following routine:
✅ Rinse thoroughly with cold water and mild soap or dish soap until the water runs clear
✅ Machine wash on a long, cold cycle (30°C or lower) with a gentle detergent
✅ Do not use fabric softener, as it can leave a residue that traps bacteria and clog the absorbency pad
✅ Hang to dry in a well-ventilated area, or tumble dry on low heat
✅ Ensure your underwear is completely dry before storing in a breathable space
You can always refer to our full care guide here: How to Care for Period Underwear!
Final Thoughts
Odour in period underwear isn’t a reflection of your hygiene—it’s often a sign of trapped moisture, synthetic materials, or incorrect care. Choosing breathable, natural, antimicrobial fabrics like bamboo, and following a consistent care routine, can make all the difference.
At Revol Cares, we make leakproof underwear that supports you on your heaviest days—with no compromises on comfort, performance, or freshness! 👉 [Explore our styles →]
