Unused item. I am selling the ones I didn't use after purchasing them in bulk. The overall thickness is uniform, approximately 1mm. There is no thickness at the bottom of the pad. These pads are designed to correct the lines without pushing up or gathering. Made of soft urethane material, they are also recommended for use as swimsuit cups. I also sew these in place of the hard cups that originally came with my rash guards and swimsuits. They are thin and soft, so they don't press against the bones and are comfortable. They are also excellent as built-in pads for wire-free bras. They are washable, dry quickly, and are very useful. I plan to ship via non-standard mail, so the delivery time may be a little longer than usual. Thank you.