What do you folks use to keep your boots from cracking/weather cracking of what ever you call it.

I have a pair of Frog Tog hippers that are at most 18months old. They have started showing cracks on the boot portion. I had them hanging in the garage, but in the summer it does get hot inside. They were not left in the sun.

Do you keep them conditioned with something and if so what? I guess that I am going to have to buy new ones each season.

Stuff sure doesn't last like it used too.

Thanks for your thoughts.
Dick