Ruby Love Period Leggings ($50) feature a full-length leg and a waistband that hits just below the naval. The brand notes that these black leggings are made with a leak-proof liner consisting of two layers of 100 percent absorbent cotton and a dri-tech mesh that can be worn alone or with another menstrual care product. The webpage doesn't note exactly how much liquid they absorb. So if you're nervous about wearing them to the gym on your period, consider giving them a test-run during an at-home workout first.