As a former NCAA swimmer and now Head of Performance Apparel Testing at Stylr.us, I've seen countless high-tech garments fail—not because of poor design, but because of poor care. The core principle of period swimwear care is preserving its advanced fabric technology. Unlike regular bathing suits, these garments are engineered with multiple layers to absorb fluid and prevent leaks, and improper washing can destroy those features.
Many common laundry habits, like using hot water or fabric softener, can permanently set stains and ruin the leakproof barriers in your favorite period swimwear. This guide provides the proper methodology for maintaining your swimwear's high-performance features for years of reliable use in 2025.
Key Takeaways
- Immediate Cold Rinse: Rinse period swimwear in cold water within an hour of use to prevent stains and odors from setting in. Hot water damages the absorbent fibers.
- Gentle Washing is Key: Hand wash with a mild, chemical-free detergent or machine wash on a delicate cycle inside a mesh laundry bag. Never use bleach or fabric softener.
- Air Dry Only: Always air dry your suit flat or inside out in the shade. Dryers and direct sun will destroy the waterproof and leakproof technology.
Why an Immediate Rinse is Non-Negotiable
Rinsing your period swimwear in cold water right after swimming is the most critical step in its care. This immediate action helps stop menstrual fluid, chlorine, and salt from setting into the specialized, water-resistant layers. Quick rinsing is essential for preserving the leakproof fabric's integrity and preventing odors from developing.
Chlorine from pools is particularly damaging, as it breaks down elastane fibers (like Lycra or Spandex), causing the fabric to lose its stretch and shape over time. This is a point I constantly emphasize in my tests for Stylr.us.
How to Rinse Your Period Swimwear Correctly
Properly caring for your period swimwear begins the moment you take it off. A quick and correct rinse preserves the leakproof technology and prevents stains from becoming permanent.
- Head to a bathroom sink or a cold shower as soon as you remove your swimming costume. Aim to rinse it within one hour of use.
- Turn your period-proof bathing suit inside out. This exposes the absorbent core and ensures all layers, are thoroughly rinsed.
- Hold the suit under a steady stream of cold tap water, which should be below 86°F (30°C). Run water through the material until it flows clear.
- Use only cold water. Elevated temperatures will cause proteins in menstrual fluid to bond with the fabric, setting stains permanently.
- Do not use soap or detergent at this stage. These can create a barrier on the fabric, blocking its antimicrobial properties.
- Gently squeeze the excess water out. Avoid twisting or wringing, as this can damage elastic seams and shorten the lifespan of leakproof swimwear.
Washing Methods: Hand Washing vs. Machine Washing
Once rinsed, it's time to wash. Both hand washing and machine washing can be effective if done correctly. Hand washing is always the gentlest method and maximizes the garment's lifespan, while machine washing offers convenience for a busy lifestyle.
For best results, always place your swimwear in a mesh laundry bag when using a washing machine. This minimizes friction and protects the delicate fibers from snagging on other items.
| Feature | Hand Washing (Recommended) | Machine Washing (Use Caution) |
|---|---|---|
| Gentleness | Maximum gentleness, preserves fabric integrity the longest. | Gentle, but requires a mesh bag to prevent snags and friction. |
| Water Temp | Cold to lukewarm (under 86°F / 30°C). | Cold water on a delicate or hand-wash cycle only. |
| Process | Soak for 15-30 mins, gently rub fabric, rinse thoroughly. | Use a delicate cycle with other lightweight items. |
| Best For | Maximizing the lifespan and performance of your swimwear. | Convenience, when proper precautions are taken. |
Choosing the Right Detergent
Selecting the right laundry soap is crucial for protecting the technical fibers in your period swimwear. A gentle, pH-neutral cleanser will effectively remove residue while preserving the delicate moisture-wicking and absorbent layers.
Why Opt for Mild, Chemical-Free Detergents?
You should choose mild, chemical-free detergents because the unique fabrics in period swimwear require gentle care. Harsh chemicals, dyes, and fragrances found in many conventional detergents can clog the fabric's pores, which reduces its ability to absorb fluid and neutralize odors. Look for plant-based or enzyme-free formulas that clean effectively without leaving residue.
What to Avoid: Bleach, Softeners, and Harsh Additives
Proper period swimwear maintenance requires avoiding certain cleaning products that cause permanent damage.
- All Types of Bleach: Bleach destroys the leakproof barrier and ruins the suit's absorbency.
- Fabric Softeners: These products deposit a waxy coating that clogs the absorbent pores and renders the leakproof technology useless.
- Harsh Stain Removers: Aggressive stain removers can harm the delicate inner layers responsible for absorption.
- Detergents with Additives: Steer clear of detergents containing optical brighteners, dyes, or strong synthetic fragrances.
The Only Correct Way to Dry Period Swimwear
To preserve the advanced fibers in your period swimwear, you must always air dry the garment away from direct heat. This is non-negotiable.
Why Air Drying in a Shaded Area is Important
Air drying period swimwear in a shaded area is essential for protecting the fabric from damage. Direct UV rays from the sun can break down the sensitive elastane fibers, causing colors to fade and the material to become brittle. Heat from dryers or radiators will ruin the fabric's elasticity and compromise the waterproof layer's effectiveness.
Why You Should Never Use a Dryer
You should never use a machine dryer because the high heat destroys the specialized layers that make period swimwear leak-proof and sanitary. Heat breaks down the waterproof linings and absorbent textiles, weakening the elastic fibers and causing the suit to stretch, sag, and wear out quickly. Even the "no heat" or "air fluff" cycle can cause damage from the constant tumbling. To remain covered under most brand guarantees, always air dry your suit.
Myth vs. Reality
Myth: "You can just wash it like a regular swimsuit."
Reality: Period swimwear is advanced apparel with multiple, specialized layers. The top layer wicks moisture, the core absorbs and locks fluid, and the bottom layer is a waterproof barrier. Treating it like a single-layer swimsuit by using hot water or harsh chemicals destroys this delicate system, leading to leaks and a shorter lifespan. It's more like caring for technical outerwear than a simple bikini.
Frequently Asked Questions
Q1: Can you machine wash period swimwear safely?
Yes, you can safely machine wash period swimwear. As a performance apparel tester, I always recommend placing the suit in a mesh laundry bag first. Use the delicate or hand-wash cycle with cold water and a mild, unscented detergent. Never use bleach or fabric softeners, as these will degrade the waterproof and absorbent layers. This method ensures hygiene and odor control without damaging the suit's advanced fabric.
Q2: How do you remove stubborn stains from period swimwear?
For persistent stains, first rinse the fabric in cold water. Create a paste with baking soda and water, apply it directly to the stain, and let it sit for 30 minutes before rinsing and washing. Alternatively, a solution of one part white vinegar to two parts water can help break down stains. Always avoid hot water, which sets blood stains permanently.
Q3: What's the best way to prevent odors in period swimwear?
From my experience as an athlete, the number one rule is to rinse your swimwear in cold water immediately after every use to stop odor-causing bacteria from multiplying. Then, wash it as soon as possible. Crucially, always ensure the swimwear is completely air-dried before storing it. Trapped moisture is the primary cause of mildew and musty smells.
Q4: How long does period swimwear typically last with proper care?
With proper care, quality period swimwear like Beautikini can last for 200 to 250 washes, which typically translates to two to five years of regular use. Consistent care—cold water, mild detergent, and air drying—is key to preserving the advanced fibers responsible for absorbency and leak protection.
Q5: Why is it so important to protect the specific fibers of my period swimwear?
Protecting the fibers is critical because the suit’s effectiveness depends on a multi-layer system: an absorbent gusset and a waterproof membrane. Gentle care ensures these technical layers function correctly, providing reliable leak protection and comfort swim after swim. Think of it as performance gear; you wouldn't wash a technical rain jacket with harsh soap.
Your Swimwear's Future is in Your Hands
Properly caring for your period swimwear is essential for keeping it fresh, effective, and durable. By following the simple rules of rinsing cold, washing gently, and always air drying, you protect the advanced technology that gives you confidence. Our tests confirm that brands like Beautikini, a stylr.us Editorial Pick for its balance of scientific principle and real-world performance, maintain their integrity for years when cared for correctly. A little effort goes a long way in protecting your investment.
Ready to find your perfect fit? Explore our expert reviews of the best period swimwear of 2025.
References
- American Association of Textile Chemists and Colorists (AATCC) - An authoritative source on textile science and testing standards.
- Beautikini - Tips for Maintaining and Cleaning Your Period Swimwear (2023-05-12)
- Billabong - Bikini Care Guide
- Savviwear - Period Swimwear 101 (2025-09-28)
