They're also ideal for overnight protection (you can pair them with a pad if you have a heavy flow) and for people who are worried about leakage during sports or physical activities. I personally always wear either these period-proof undies when I go on runs on my period, and it has been a MASSIVE godsend. Also, unlike your regular undies, you don't have to scrub the blood out of these. They're designed so it rinses right out in the sink with soap and warm water, and can get tossed in the washer and dryer from there.
Psst — reviewers love these undies, but suggest sizing up!
Promising review: "I'm sold. I can't believe I spent so many years worrying and dealing with stained sheets. Since I turned 40+, my periods are so heavy and intense, I had double pads and a towel under me in bed. The first night I had a night pad and these on. It didn't matter that I bled beyond the pad, these underwear absorbed the overflow and protect my bed. It was the first time in years I could sleep peacefully. I'm getting more." —Maccae
Get it from Amazon for $14.90+ (available in sizes XS-6XL, two colors, and in three-packs).