Swimming caps may last anywhere from one month to three years, depending on the material used, how frequently you wear them, and how well you care for them. A swimmer who uses a latex cap 8 or 9 times per week may get a month or two of usage out of it if they dry and powder the cap after each use. Someone who wears their cap more often will need to buy another one sooner. All things being equal, the longer a cap lasts, the better it is for your hair. However, there are several factors that will determine how long a cap will last, such as the type of fiber used to make it and how clean your hair is when you remove the cap. If you can't wear your cap for more than five days at a time, it's time for a new one! Latex and silicone swim caps are the most durable because they don't absorb water like foam does. Wool and human hair caps are next in line because they're natural materials that don't break down over time. The least durable caps are those made from synthetic fibers because they tend to lose shape and become uncomfortable after several uses. Caps can be cleaned by hand-washing them in cold water with a gentle shampoo; drying them completely before putting them back on; or using an electric cap shaver. Make sure not to use a hot comb or brush to style your hair while it is still wet from the shower because this will cause the cap to melt away.