I have really heavy, large clots, and 14+ days long periods. I’ve been using a cup for about 10 years now. I do pair it with thinx cheeky period underwear on my heavy days. Recently I got the femmycycle cup and it’s a game changer. It’s not meant to open fully so it creates kind of a suction. It pulls blood in. Clots don’t stand a chance. The blood has thinned out and is more watery now instead of thick like jam. Still have clots but I don’t have that day in the middle of my period when I’m like oh, am I done. Then the next day the clots pass and the flood gates reopen. My period has gone from 14+ days to 10 days and now to 7 days. I haven’t had a 7 day cycle in years. I’m 38 with no kids. I usually use the smaller cups. I got the regular and low cervix set on amazon. There is a bit of a learning curve switching from a different style cup to this one as it doesn’t pop all the way open. I have also noticed less cramps, back pain, and headaches as well.