US: XL to Europe Size 18

US: XL: Corresponds to a wrist circumference baseline of 19 $\text{cm}$ (7.5 $\text{in}$), bracelet length of 21 $\text{cm}$ (8.3 $\text{in}$), and fit classification Relaxed / Expanded.

Europe Size 18: Corresponds to a wrist circumference baseline of 16.5 $\text{cm}$ (6.5 $\text{in}$), bracelet length of 18 $\text{cm}$ (7.1 $\text{in}$), and fit classification Standard / Regular.