THINX can replace pads & liners *and* be used as a backup or replacement to tampons and cups. They absorb up to 2 tampons' worth of blood, yet they look and feel like a regular pair of underwear. THINX is made up of four bits of tech that makes ‘em anti-microbial, moisture-wicking, absorbent, and leak-resistant. The top layer fights bacteria and absorbs any liquid into the über thin layer right beneath it, so you always stay dry (and fly, obvi).