I have purchased several styles from the Red range for my 15 year old daughter who has started her periods this year. She is very sporty and found pads a bit uncomfortable and would leak onto her underwear during activities, so I looked for alternatives and did lots of research and chose to try these for her. She has the bikini style and boy shorts style in several different colours and patterns. She seems to prefer the black ones. Periods have been very irregular to start with, some very light and others heavier. So far there have been no leaks when using any of the pants. She has only used them on their own, she has worn them all day even when playing sport and no problems whatsoever, and another pair for night. I purchased size 14-16 in the Red range and they are a little snug but I think they probably need to be in order to work well. If purchasing from the ModiBodi range I would order ladies size 12. They are expensive to start off with, but I think in the long run it will be worth it.