Men's waist sizes are typically measured in inches and indicate the circumference of the waist. Common sizes range from 28 to 40 inches, but some brands offer larger or smaller options. To find the right size, men should measure their waist at the natural waistline, which is usually just above the belly button. Waist sizes are often labeled as S (small), M (medium), L (large), and XL (extra-large) in clothing stores. It's important to note that different brands may have slight variations in sizing, so trying on clothing or checking size charts can help ensure a proper fit.