The size tag is a small label, usually found inside the sneaker, that displays the size, article number, and other information about the shoe. It is an important aspect of a sneaker as it helps identify the size and style of the shoe, and is used to ensure that the correct size is being purchased. This tag is typically found inside the shoe, and is usually located near the tongue or insole of the shoe. It is also important to note that size tags can be removed or replaced, which can be an indication of a counterfeit sneaker. Therefore, it is important to check the size tag, as well as other authenticity markers, when purchasing a new pair of sneakers.