Designed to provide a more hydrodynamic feel while in the pool, swimming caps also help to keep your hair away from your face during your laps. When looking at swim caps for adults and swim caps for kids, one of the main differences is in the type of material used in the construction. Latex caps tend to be thinner, making them more comfortable in heated pools and during extensive workouts. A latex cap also provides a better fit to dedicated swimmers who have chosen to shave their heads. Silicone caps are more durable, offer a contoured fit for people with longer hair and have a softer feel that makes them easier to put on and take off. No matter what material you choose, look for a cap that fits snugly and feels good as you swim.