I tested these out and was shocked (in a good way) how much blood they hold. I've tried other brands in the past and have leaked more than once. In total transparency I normally use 1 super tampon every 2-3 hours on my heaviest days. I slept in the heaviest version of the underwear and used a tampon as well. On my last day i did not wear anything except these. I recommend.
More colors and styles would be nice!