We recommend you go for the same size as you usually choose. Our period-proof panties are designed to feel snug at first, and then relax with washing and repeated wear for that perfect fit. See our size guide here. To make sure that you find your perfect fit, our underwear comes in a wide range of sizes. Women: XS, S, M, L, XL, 2XL, 3XL. Teens: 134/140, 146/152, 158/164, 170.