Hat care products are insurance (that really works) for hats. You pay good money for a top quality felt fedora or panama straw porkpie, so you need to have a high-grade cleaner that's safe to use on that specific material and can remove stains from the hat properly, without ruining it. You should have a proper hat brush too (natural horsehair bristles are best) and remember to use the dark brush on your dark fur felt dress hats, saving your light-colored brush for fur felt hats in beige, eggshell, tan and other light colors. If you try brushing your straw hat, I swear I'll cry.
The hat care products you see here are only those I personally use and recommend, whether it's a stiffener to add shape and body to felt hats or a stain repellent that protects most hats from water and oil-based stains.
Life happens to hats too, you know. Get your hat care products so you and your hat can breathe easy.