how Thinx work

Everyone’s flow is different, so you can wear Thinx for as long as your flow will allow. And of course, the style you wear also plays a factor, as some styles are more absorbent than others. We measure our undies by absorbency with our highest absorbency styles holding 5 regular tampons' worth. So for some customers, that means wearing them the whole day, and for others that may mean carrying an extra pair of Thinx as a backup. If you're still unsure, we recommend taking our Know Your Flow quiz.

Thinx will last at their maximum tech performance for the industry standard of 40 washes or around 2 years, if cared for properly. This means washing them on a gentle cycle with the rest of your delicates, never using bleach or fabric softener, and always hang drying!

One way to tell when your undies are full is looking at the side seam of the gusset and feeling if it is wet. If you notice blood at the seam, this is a good indication that your Thinx are full. Over time, you’ll start to get a sense of your unique flow and how long you can wear certain absorbencies on certain days of your cycle. If you’re new to Thinx, we always recommend bringing an extra pair along and changing 'em sooner rather than later.

Yes, Thinx are safe (and comfy) to sleep in! We even have a sleep-dedicated product, the Sleep Shorts, which are boxer-inspired pajama shorts that hold up to 5 regular tampons' worth. They're built with a longer, extended gusset to prevent any stains or leaks overnight. Other popular favorites for sleeping are the Super Hiphugger and Boyshort.