Ba&sh uses its own numeric size system (00, 0, 1, 2, 3) which maps to letter sizes (XXS, XS, S, M, L). The brand publishes conversion across nine regions including FR, UK, US, Germany, Spain, Italy, Japan, Korea and China, making it one of the most internationally-referenced size guides in the portfolio. Body measurements are given in cm and inches as the brand publishes. The Ba&sh FR sizing chart includes a 6th row (FR 42) that the brand publishes for conversion reference but does not sell — that row has no Ba&sh size. For belts, the numeric size (75, 80, 85, 90) corresponds to the body circumference where the belt sits — "low rise" is the hip measurement, "high rise" is the natural waist. Match the belt size to where on your body you want to wear it.