These days, we have our fair share of period product choices for when Aunt Flo decides to come to town—between tampons, pads, a menstrual cup, and more, there are tons of ways we can protect ourselves from a possible leak.

However, there’s one new product that’s kind of no product at all: a pair of underwear.

Before you shudder at the thought of not protecting yourself during your period, hear us out. The underwear is called Knix Wear, and they’re actually extremely protective. The company offers a line of leak-proof, moisture-wicking underwear that’s great to wear during your period.

One caveat here—they’re best for using when your period is light. “Depending on how heavy your period is, [they’re] really great for the lighter days,” says Joanna Griffiths, the founder of Knix Wear. If you know you have a super heavy flow in the beginning of your cycle, you should use extra protection.

Other than that, these are the coolest invention since…well, since the tampon! Here’s what you should know about period proof panties, and why they should be in your next shopping cart:

1. They can save you money

   Since they’re re-wearable, you don’ have to be shelling out tons of money on tampons and pads each month. The average women spends $1,773.33 on tampons and $443.33 on panty liners throughout their life. Knix Wear is affordable, plus they even offer a subscription service called Club Knix, which sends you one pair of undies a month. Sign us up!

2. There are a ton of different (cute) styles

   You know those “granny panties” you reserve just for period days? This is so unlike those it’s not even funny! Knix Wear comes in boy shorts, high-rise, thongs, athletic bikinis you name it, plus tons of colors to choose from. You don’t have to feel gross in these—they’re meant to be feminine and make you feel beautiful, even when you’re doubled over with cramps.

3. You’re helping the environment

   Women in America toss about seven pounds of feminine hygiene products every year. That averages to an estimated 700 million pounds of products (tampons, pads, panty liners, etc.) each year. Period under will help you reduce your carbon footprint and help eliminate some of this crazy waste.

4. New pairs are always coming out

   “Kind of like the iPhone,” Griffiths jokes, Knixwear is always coming out with new and improved underwear models for their customers. This is a company who really listens to their buyers, and is always trying to improve what they have, making it even more absorbent, comfortable, and innovative.

5. They seriously work

   Period panties include a super-absorbent pad with leak resistant backing built right into the underwear. The key is, it’s so thin, you don’t even notice it’s there, so you can do all the things you normally do without even worrying about it. Each pair is made form a patented technology that can hold in 1-3 teaspoons of liquid. They’re super comfortable, absorbent, leakproof, and above all, worry-free.

What do you think of period panties? Do you think you’d ever ditch the tampon and purchase a pair of these instead?