UndiePads® and PantiePads® both feature a built-in menstrual pad designed for maximum absorbency and ultimate comfort. The uniquely shaped pad is sewn right into the panties, stays in place, day or night, without bunching or shifting. The difference is in the fabric. UndiePads are made of a lightweight fabric that's enhanced with Spandex to hug the body and provide gentle control and shaping. PantiePads’ fabric is cool, breathable and lightweight. Both are so comfortable, you'll almost forget you're wearing them.