Period Underwear vs Pads, Tampons and Menstrual Cups

Period underwear vs pads, tampons and menstrual cups comes down to how each option works, how it feels and what it costs over time. Period underwear is reusable, worn externally and has absorbent protection built directly into the fabric, so there is nothing to insert, attach or throw away after every use.

For many people the best solution is not one product forever, but different options on different days of their cycle. Here is a simple comparison of period underwear, pads, tampons and menstrual cups, looking at how they work, comfort, cost over time and waste.

Period underwear vs pads, tampons and cups 

In short, here is how each one works.

• Pads sit inside your underwear and absorb flow from the outside.
• Tampons sit inside the body and absorb flow before it leaves.
• Menstrual cups sit inside the body and collect flow rather than absorbing it.
• Period underwear does the job of a pad, but the absorbent layers are built into the fabric, so there is nothing extra to insert or stick in place. You wear it, wash it, and wear it again.

If you want the full picture of how the layers work, read what period underwear is and how it works.

Period underwear vs pads: which option is right for you?

Period underwear and pads both absorb flow outside the body, but the experience is quite different. Some people prefer period underwear because it feels more like normal underwear and does not have adhesive, wings or a separate pad sitting against the body.

Pads are familiar, easy to carry and require no washing. Period underwear, on the other hand, stays in place as part of the underwear itself and can be washed and worn again. The main trade-off is that it needs washing and drying between wears. For someone who already likes pads but wants a reusable option with less disposable waste, period underwear can be an easy place to start.

Period underwear vs tampons, what is the difference?

Tampons sit inside the body and absorb flow internally, while period underwear stays completely external. Many people like tampons because they are discreet and practical for activities such as swimming or sport. Others prefer not to insert menstrual products, particularly overnight or on lighter days.

Period underwear gives you another option. Depending on your flow and the absorbency of the pair, it can be worn on its own or together with a tampon for extra protection on heavier days. THATDAY period underwear can be worn for up to 8 to 10 hours depending on your flow and the absorbency level, although you should always change sooner if the pair starts to feel full. You can also see more practical tips on combining period underwear with tampons on the THATDAY Instagram.

Period underwear vs menstrual cups, which should you choose?

Both menstrual cups and period underwear are reusable, but they work in completely different ways. A menstrual cup is inserted into the body and collects menstrual flow, while period underwear absorbs flow externally and is worn like regular underwear.

Some people prefer menstrual cups because they can be worn for longer before emptying. Others prefer period underwear because there is nothing to insert or remove. And the two do not have to compete. Period underwear can also be worn together with a menstrual cup as an extra layer of protection on heavier days.

Can reusable period products save money over time?

They can. Pads and tampons need to be repurchased every cycle, while reusable products such as period underwear and menstrual cups are designed to be used again and again.

A THATDAY pair is designed to last for up to five years with proper care, and depending on the style it can absorb up to the equivalent of 6 regular tampons worth of flow. The upfront price is higher than buying one packet of pads or tampons, but the cost is spread across many wears, which can reduce how often you need to buy disposable products.

Which period product creates the least waste?

Reusable products generally create less ongoing waste than single-use pads and tampons because they are worn repeatedly instead of being thrown away after each use.

THATDAY has previously shared estimates that a person may use thousands of disposable menstrual products across their lifetime. The exact number varies depending on cycle length and product use, but the difference is simple. Disposable products create repeat waste every month, while reusable products can reduce it over time.

How do you switch to period underwear?

The easiest way to switch is to match a pair to your flow and start on lighter days or overnight, then use period underwear as backup with a tampon or cup on heavier days until you are comfortable letting it take over.

You do not have to give up your usual products all at once. THATDAY makes pairs for light flow, medium flow and heavy flow, so you can choose the right level instead of guessing. Many people begin with one or two pairs, wear them on their calmer days, and add more as they find their rhythm.

The takeaway

Period underwear vs pads, tampons and menstrual cups is not really about finding one product that is best for everyone. It is about choosing what works for your body, your flow and your day. Pads and tampons are disposable and familiar, menstrual cups are reusable but worn internally, and period underwear is reusable, worn externally and has absorbent protection built directly into the fabric. You can use it on its own, overnight or together with a tampon or cup when you want extra protection.

If you are ready to try it, browse the full THATDAY collection and choose the absorbency that matches your cycle. You can always keep your usual products alongside while you find your rhythm.

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