It is used to protect the ears from the intrusion of water. Pool water causes earaches and several diseases due to chemicals present in it. Ear plugs are made of soft plastic or silicon so that it can quickly adjust to the ears' size without causing any inconvenience.
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It is like a Jell-O which is mixed with water and is applied on hair with the help of a comb leaving it untouched for few minutes, making the hair to stick at their place and thereby not hindering the player's performance.
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It is a wire made device covered with plastic or rubber and is worn during aquatic sports to prevent the water from getting inside the nose. The clip blocks the nostrils partially and permits the swimmer to breathe only.
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Swim caps are usually worn by long haired swimmers to protect their hair from chlorinated water and to reduce drag in the water caused by loose hair.