On the list of gross experiences, the sudden realization that your shower isn’t draining—or even worse, that your shower drain is backing up all over your feet—is definitely high on the list. The major cause of drain clogs is hair, which can clump inside the drain and prevent other stuff, like soap residue and body oils, from flushing down. And, once you have a clogged drain, you’re faced with trying to dig out or dissolve that clog yourself or with the help of a plumber. This is definitely one of those things where an ounce of prevention trumps a pound of cure. Here’s what to look for in a hair catcher to keep your drain flowing freely.