These nighttime diapers are perfect for our tall 3 year old.  He is almost 50lbs and is potty trained during daytime, but still needs a diaper at night.  The biggest diaper is typically a size 6, so we found these.  He has had some issues with leaks, so we designated a cut off time for beverages 2 hours before bed (of course he gets a small drink before bed if he wants).  He potties before bed and often has dry diapers.  They do the job.  They absorb small amounts of urine but not an overload!  They are plain white, with a light purple strip on the back, which tells him which side the back should be.  Easy.