Generally, no, you do not need to wear a pad with period underwear because the product is designed to function as a complete, standalone form of menstrual protection. Period underwear is a reusable garment engineered with specialized fabric layers to absorb and contain menstrual flow, much like a pad or tampon. The main purpose of these undergarments is to replace disposable products entirely.
The Technology That Makes Period Underwear Work
Period underwear relies on a multi-layered system to manage menstrual fluid. The layer closest to the skin is a moisture-wicking fabric designed to pull liquid away quickly. This keeps the surface feeling dry and comfortable, preventing the damp sensation associated with traditional pads.
Beneath this top sheet lies the absorbent core. This middle section contains specialized fabrics that trap and lock the fluid away, preventing it from pooling or leaking. Depending on the design, this core can hold a significant amount of fluid, ranging from the equivalent of one to four or more tampons’ worth, sometimes up to 60 milliliters.
The final layer is a built-in leak-proof barrier made from a breathable, waterproof material. This layer ensures that the trapped moisture does not penetrate the fabric and stain clothing or bedding. This layered construction allows the underwear to be worn for up to 12 hours, providing comprehensive protection without any additional products.
Scenarios Requiring Additional Protection
While period underwear works well as a primary product, there are specific situations where a secondary option might be considered.
Individuals experiencing an exceptionally heavy flow, especially during the first day or two of their cycle, may choose to pair the underwear with an internal product like a menstrual cup or tampon. This maximizes security when flow exceeds the garment’s absorbency rating.
Using an internal product as a backup is typically preferred over adding a pad, as the goal is to avoid external bulk and maximize comfort. If you plan on extended wear times beyond the recommended 12 hours, such as during long travel days, a supplemental product can provide extra peace of mind. For most users, selecting the correct absorbency level—light, moderate, or heavy—is enough to manage their flow without extra protection.
Best Practices for Usage and Care
For period underwear to perform optimally as a standalone product, proper sizing and meticulous care are necessary. The garment must fit correctly; a pair that is too loose can shift and create gaps, which can lead to leaks around the edges of the absorbent panel. Selecting the appropriate absorbency level for the heaviest day ensures confidence in the product’s capability.
After wearing, the immediate step is to rinse the underwear in cold water until the water runs clear. Hot water must be avoided, as heat can cause blood proteins to coagulate, setting the stain permanently into the fabric.
For washing, use a mild detergent on a gentle cycle and avoid fabric softeners or bleach, since these chemicals can coat the fibers and drastically reduce the absorbency of the specialized material. Finally, always air dry the underwear; high heat from a machine dryer can degrade the material and compromise the leak-proof barrier.