A while ago I asked for recommendations for period pants and some of you recommended Modibodi.
One period later and DD and I are very happy with them. They wear well, she had no leaks (saying that, her period is luckily not that strong yet), she wore them for PE without issues (playing rounders).
I already ordered two more, the only negative point is that they take a while to dry and I find the sizing on the snug side, she wears either Red (teenage range) in 14-16 or size 8 in their adult range. Her normal trouser size is 13-14.
I also would wish for more colours in the adult one, a bit too much lace, DD is still 11.