Period Underwear vs. Pads, Tampons and Cups: An Honest Comparison

There isn't one correct period product — there's a set of trade-offs, and which ones matter to you depends on your flow, your routine, and what you find genuinely comfortable rather than just tolerable. This is a comparison, not a pitch; period underwear is what we make, but it isn't the right fit for every single day or every person, and it's worth saying so plainly.

Pads

Pads are the most familiar option for a reason: no insertion, easy to check visually, widely available. Their downsides are the ones most people already know from experience — they can shift out of place, they trap heat and moisture against the skin over a full day, and a single pad's capacity is fixed regardless of how your flow actually moves through the day. They're also the highest ongoing cost over time, since every single one is used once and thrown away.

Tampons

Tampons solve the movement and heat problems pads have, and they're compact enough to carry discreetly. The trade-off is that they need to be timed — worn too long, they carry a small but real risk of toxic shock syndrome (TSS), which is why the box recommends changing every 4–8 hours regardless of how full one feels. They also don't manage light spotting or discharge outside your period the way other options can, since inserting one for very light flow is neither comfortable nor necessary.

Menstrual cups

Cups hold significantly more than a pad or tampon and can be worn up to 12 hours, which makes them a favourite for people who want to think about their period as little as possible during the day. The trade-off is the learning curve — insertion and removal take practice, they're not the easiest option for public restrooms without a sink nearby, and sizing (based on age, childbirth history and cervix height) is more involved than picking a pad size off a shelf.

Period underwear

Kiri's daywear holds up to 50 ml (about 5.5 tampons), and nightwear up to 75 ml (about 8.5 tampons), across a four-layer construction — moisture-wicking, antibacterial, absorbent core, leak-proof shield. Worn on its own, it fully replaces pads and tampons for most of a cycle; on the heaviest day, some people wear it as backup alongside a tampon or cup rather than as a replacement. Its real advantage isn't capacity — cups hold more — it's that there's nothing to insert, time or dispose of. You put it on like regular underwear and go about your day.

The honest downside: it needs to be washed, not thrown away, which means a bit of laundry planning (see our care guide) and an upfront cost higher than a single box of pads, even though it works out cheaper over a year of reuse. It also isn't swimwear — the absorbent core would soak up pool or sea water — so it's not a same-day swap for every situation.

How people actually combine them

In practice, most people don't pick one option forever — they combine two or three depending on the day. Period underwear for daily wear and light-to-moderate days, a tampon or cup as backup on the heaviest day, and pads kept as a backup for situations where washing isn't practical, like travel. There's no prize for using only one method; the goal is whichever combination gets you through a full cycle with the least amount of thought spent on it.

If period underwear sounds like the right fit for most of your cycle, our size guide is the fastest way to figure out which style and size to start with.