As we wear our hair systems they change over time. The normal process of oxidation does it's job on human hair systems just as it does on our own growing hair. And systems slowly experience a thinning process. Sometimes when a customer gets a system they order it slightly on the heavy side knowing that it will thin out over time and get to be just right over time. A good idea is to wear a system till it gets to be exactly the way you like it---density right where you want it. Then take it off and put it away and replace it with a new system. Put the 'just right' system aside and save it for a special occasion where you want to look your best like for a wedding or family get together. You'll have a 'just right' system right where you want it for that special occasion and won't have to 'manage' a system hoping it will be just right for that party or special date.
Regards,
John