Maxi pads are absorbent pads worn inside underwear to collect menstrual blood, postpartum bleeding, or light bladder leaks. They stick to the inside of your underwear with an adhesive strip and come in a range of sizes and thicknesses to match different flow levels. A standard maxi pad holds roughly 20 to 50 milliliters of fluid, though lighter versions hold as little as 4 mL and heavy-duty versions can absorb over 50 mL before leaking.
How a Maxi Pad Is Built
Every disposable maxi pad has three functional layers, each doing a different job. The top sheet, the part that sits against your skin, is made from a soft nonwoven fabric (usually polypropylene) designed to let fluid pass through quickly while staying relatively dry on the surface. Beneath that is the absorbent core, a blend of wood pulp and superabsorbent polymers. Those polymers are tiny granules that lock liquid into a gel, which is why a used pad doesn’t feel sloshy. The bottom layer is a thin waterproof film that prevents anything from soaking through to your underwear, with an adhesive strip on the outside that holds the pad in place.
Wings, Adhesive, and Fit
Some maxi pads have “wings,” small flaps that fold over the edges of your underwear and stick to the underside. The goal is to keep the pad centered so it doesn’t shift while you walk, exercise, or sleep. Wings can be especially helpful in loose-fitting underwear, where a flat pad is more likely to slide around.
That said, wings aren’t always necessary. How well a pad stays put depends more on the quality of its adhesive, the texture of its surface, and how snugly your underwear fits than on whether wings are present. Some people find wings cause bunching or friction against the inner thigh, particularly if the wings don’t lie flat. If you’re trying pads for the first time, it’s worth experimenting with both styles to see what feels more comfortable.
Sizes and Absorbency Levels
Maxi pads are sold in a spectrum from “light” to “overnight” or “postpartum,” and the labels reflect real differences in size and capacity. A light or pantyliner-style pad holds around 4 mL of fluid and is thin enough to be barely noticeable. It works for very light flow days or as backup for a tampon or menstrual cup. A heavy or ultra pad can hold 30 to 50 mL, and it’s noticeably thicker and longer. Overnight pads are wider in the back to account for the way fluid spreads when you’re lying down.
Postpartum pads sit at the top end of the range. They’re designed for the heavy vaginal bleeding that follows childbirth, which can last several weeks. These pads are longer, wider, softer, and more absorbent than standard menstrual pads. Softness matters here because the skin around the vaginal area may be swollen, stitched, or tender after delivery. Breathability is also prioritized to reduce moisture buildup and lower infection risk. Tampons and menstrual cups are not recommended during postpartum recovery because inserting anything into the vagina while tears or incisions are healing raises the chance of infection.
How Often to Change a Pad
A good rule of thumb is to change your pad every three to four hours, even if it doesn’t feel full. On heavier days, you may need to change it more often. Wearing the same pad for too long creates a warm, moist environment that encourages bacterial growth, which can lead to odor and skin irritation. If you notice a smell or the pad feels damp against your skin, it’s time for a fresh one regardless of how recently you put it on.
Environmental Considerations
Standard disposable maxi pads contain up to 90% plastic across their layers, from the waterproof backing to the synthetic top sheet to the individually wrapped packaging. That plastic takes an estimated 500 to 800 years to break down in a landfill. Over a lifetime of menstruation, a single person can use thousands of pads, which adds up to a significant amount of waste.
If that concerns you, there are alternatives. Reusable cloth pads work on the same principle but can be washed and used for years. Menstrual cups and discs are inserted internally and collect fluid rather than absorbing it. Period underwear has absorbent layers built into the fabric. Some brands also make pads from biodegradable materials like organic cotton and plant-based backing, though “biodegradable” claims vary widely and don’t always mean the pad breaks down quickly in a real landfill environment. Each option has trade-offs in convenience, cost, and comfort, so the best choice depends on your priorities and flow.