US Size 30 typically refers to a waist measurement of 30 inches in men's clothing. This size is commonly used in pants, shorts, and jeans, indicating the circumference of the waist. It is part of a sizing system that helps consumers find the right fit for their body type. In women's clothing, US Size 30 can correspond to a larger size, often considered plus size. The sizing can vary between brands, so it's essential to check specific size charts. Understanding these measurements can help shoppers select the most comfortable and flattering clothing options for their needs.