Period swimwear is a specialized garment designed to absorb menstrual fluid, offering an alternative to traditional products like pads and tampons. It integrates absorbent technology directly into the lining of a swimsuit bottom, providing protection and discretion. A frequent question is whether these garments maintain their effectiveness when submerged in water, such as in a pool or ocean. This article examines the technology and practical application of period swimwear to determine its viability for swimming.
The Technology of Period Swimwear
The inner layer of period swimwear is typically a soft, quick-drying material designed to rapidly move moisture away from the skin. This wicking action traps menstrual fluid and transfers it downward toward the absorbent layers beneath. This top layer is engineered to feel dry quickly when emerging from the water, enhancing comfort.
Beneath the wicking layer lies the core absorbent material, often made of specialized microfibers or cellulose, which is responsible for fluid retention. This layer is engineered to hold a specific volume of fluid, usually equivalent to one or two tampons. This core is highly selective, prioritizing the absorption of viscous fluids like blood while resisting the uptake of external water.
The outermost layer is a waterproof or water-resistant membrane, frequently made from polyurethane laminate (PUL). This non-permeable barrier prevents the absorbed menstrual fluid from leaking out, even when pressure is applied during movement. The fabric density is calibrated to allow water to bead and run off the exterior, minimizing saturation of the absorbent core while submerged. Maintaining a dry core is necessary for the garment to retain its ability to absorb internal menstrual flow effectively.
Practical Use and Limitations
Period swimwear is most reliable during light to moderate menstrual flow. For very light flow or spotting, it provides sufficient protection without additional products. During heavier flow, capacity may be quickly overwhelmed, leading to potential leaks, especially when exiting the water.
The total wear time while swimming is generally limited by the volume of menstrual fluid. Manufacturers suggest a maximum wear time of only a few hours, even with lighter flow. Hydrostatic pressure and movement in the water can slightly accelerate the saturation of the absorbent core compared to dry-land use.
The chemical composition of the water can influence performance and longevity. Highly chlorinated pool water or salty ocean water does not immediately compromise the leak-proof barrier. However, repeated exposure can gradually degrade the specialized fibers and water-resistant treatments.
For extended periods or heavier flow, supplemental protection is recommended. Pairing the swimwear with an internal product, such as a menstrual cup or tampon, provides a layered defense against leaks. When submerged, hydrostatic pressure helps keep the fluid contained. When exiting, this pressure is released, making the transition the highest risk for potential leakage. Changing into a dry garment shortly after leaving the water is advised to prevent saturation-related leaks.
Post-Swim Care
Following any swim, thoroughly rinse the garment under cold running water. This cold-water soak helps flush out absorbed menstrual fluid and any residual pool chemicals or salt. Rinsing should continue until the water runs completely clear, which prevents stains from setting into the fabric fibers.
The swimwear should then be washed using a gentle cycle in a washing machine, or by hand, using a mild, enzyme-free detergent. Avoid bleach or fabric softeners, as these chemicals can coat the absorbent fibers and compromise the wicking capability. High heat should also be avoided during cleaning to protect the specialized materials.
To preserve the integrity of the leak-proof membrane and elastic components, the period swimwear must be air-dried. Using a machine dryer or placing the garment in direct sunlight risks degrading the polyurethane laminate (PUL) layer. Proper air-drying ensures the longevity and continued effectiveness of the textile technology.