A "30-inch waist" refers to the measurement around the narrowest part of the torso, typically just above the hips. This size is often used in clothing sizing and can indicate a specific fit for pants, skirts, and dresses. It is commonly associated with both men's and women's apparel, though the fit and style may vary between genders. In the context of health and fitness, a 30-inch waist can be a benchmark for assessing body composition. Maintaining a waist size within a healthy range is important for reducing the risk of conditions such as heart disease and diabetes.