I don't usually heavy flows but it so happened that this time I did. So I popped these savers and hoped for the best, especially since my sheets were white. I woke up in the middle of the night to use the toilet and I was dry and I know my flow was heavy because you can feel it buy these knickers were dry to the touch ( I'm very sensory). Went back to bed and continued sleeping for another 3 hrs and woke but this time I knew I had reached the maximum limit. That was a total of 10 hours ( from the time i wore them after a shower then 3 hrs hrs later to sleep)
Fell in love with them , I see my sanitary napkins shaking in their package for fear that they have become redundant.
In my opinion, If you use up to 3 pads within a span of 5 hrs , then a heavy flow option is best but just trying 1 for size will help you decide.
Result : You can't lose with these . Happy Dry periods....