Pads are made of absorbent material and are designed to soak up the menstrual fluid. Many girls prefer to use pads when they first get their period, but you can choose pads or tampons. Tampons are great for sport or swimming, and are more popular once girls get the hang of having their periods. Pads are available in different thicknesses and absorbencies. Thickness doesn't necessarily mean a pad is more absorbent. Ultra thin Pads do the same job as slim/maxi pads; they're just thinner and more discreet. The absorbency of a pad is also determined by its length - longer pads can soak up more menstrual fluid.
For an extremely thin AND highly absorbent pad, try U by Kotex Ultrathins. They have micro U by Kotex Ultrathins are available in Regular, Super and Overnight absorbencies. Regular absorbency is great for everyday 'regular-flow' use and Super and Overnight absorbency is perfect for heavy flow and overnight use. So, we have you covered, no matter what your flow is like, or what you're doing.