Check out the Adidas Techfit Period-Proof 7/8 Leggings which are perfect for running when on your period. I love that the waistband is high, so they don’t sit on or press on the areas I’m like to have discomfort during my period. The pocket on the thigh is large enough to hold a phone and it feels secure enough while running. Mesh panels behind the knees and lower legs keep improve breathability too. LTKunder50 LTKFitness LTKeurope