For ballet point shoes, they will eliminate the toe box from breaking down due to moisture from being worn for long periods. Although originally designed for ballet shoes, these can be used for shoes of any type and will keep the shoes from getting odors, perfect for children tennis shoes.
They remove odors from shoes which currently have "that smell". Since they actually absorb the moisture, your shoes will not have any strange smells. Give them a try you will not be disappointed! They come in baby powder scent or unscented.