My 9mo son always leaks through his soakers. We fold these in half and add them to the front to soak up extra urine and they work beautifully. We still get the occasional leak, but not nearly as much.
We love these grovia boosters! we use them at night time for our 7mo which keeps her dry and leak free all night long!
It's hard to determine how "stay dry" these are since there's a hint of moisture when we change the diaper we've used them for, but that hint of moisture is far better than our typical sodden nighttime diaper, so I like to think that it is more comfortable for my child's skin (they, of course, are unable to verbalize their thoughts on the effectiveness :D). I purchased them for a roadtrip initially, not because we wanted to change the diaper less, but because considering being confined sitting in the diaper between diaper changes seemed particularly uncomfortable. As I mentioned initially, I'm also incorporating them into our nighttime routine, too. Between our cloth wipes, homemade wipe solution and these stay dry soakers, I really feel like we're doing just about everything we can to avoid irritated skin.