Weight capacity. The capacity of shower benches can range from 250 pounds to 400 pounds. Consider the size and weight of the people or individual who will be using the bench before you buy one.
Suction cups. If you're buying a folding or free-standing bench, i.e. a bench or seat that doesn't require installation, make sure it has suction cups on the feet. This will ensure that the bench doesn't move around in the shower.