Use a tape measure to determine the width of the shower drain. Be as precise and accurate as possible when taking the measurements, and make sure you note them down.
Visit a local hardware store and go to the plumbing aisle in the store. Search for a shower drain hair catcher. You may be able to find more than one brand. If that is the case, choose a brand that suits your budget. However, if you are unable to find a shower drain hair catcher at a local hardware store, you will have to take a trip to a chain hardware store.
Depending on the measurements that you took, purchase a hair catcher of your chosen brand. Make sure that the catcher you bought will properly fit the shower drain before you pay for it. Talk to a representative at the store if you are not sure.
Place the hair catcher over the drain of your shower. Keep in mind that this will slightly compromise the speed at which used water is drained. However, you should not have a problem with that because a hair catcher will catch all the hair that falls off your head and into the bath tub. When you are done taking a shower, be sure to wipe the hair catcher clean, and dispose of the hair before leaving the bathroom.