Shoe sizes, even though standardized, can fit you differently. Particularly, if you are looking for a half size, it can be hard to find. Inserts can come in extremely handy. If you have a shoe that is slightly big, an insert can help fill it up and provide a snug fit. In fact inserts are the go-to option when it comes to comfort, warmth and a better fit. The use of inserts can also help provide balance and stability to the foot. That you can also take it out and clean it is an added perk.