Although the period underwear do work they had flaws in the stitching, but we also bought a swimsuit. The swimsuit had pieces of something between the layers that made you look like you had growths. Knix customer service offered a partial credit towards purchasing another item. We now have a swimsuit we won’t wear because people literally stare because of the bumps between the layers. The items we purchased had several flaws and their customer service people offer no exchange, only that they will give a partial credit towards another product. If you purchase something flawed, used your partial credit towards another item that is also flawed, why would anyone purchase yet another flawed product?! We have moved to a different company that actually backs their product with exchanges if flawed.