Does your swimmer have long hair?  Check out swim caps at B&B Aquatics located off Manchester Road in Des Peres.  http://bbaquatics.com/wp/shop/category/equipment-apparel/caps/  The staff at B&B can also help fit your swimmer with a good pair of goggles or even a competitive style swim suit.  These are all things that will help your swimmer be more efficient in the water and help them be better swimmers.