The US shoe size system is a standardized method used to measure the size of shoes in the United States. It typically ranges from size 0 to size 16 for adults, with half sizes available for a more precise fit. The sizing is based on the length and width of the foot, ensuring that shoes provide comfort and support. In the US shoe size system, men's sizes are generally larger than women's sizes. For example, a men's size 8 is roughly equivalent to a women's size 9.5. This difference is important for consumers to consider when purchasing footwear across different categories.