When I was a kid, protecting comic books was the furthest thing from my mind. It is a self-defeating mindset to have if you love comic books. Comic books depreciate in physical and potential investment value due to exposure to the elements. You should be aware of every option available when it comes to comic book sleeves. They’re the bare minimum in protection for comics.
All of your comic books should be in mylar comic book sleeves with acid-free backing boards to protect them.
