US: S to Europe Size 56-21-150

US: S: Corresponds to a lens width baseline of 49 $\text{mm}$ (1.93 $\text{in}$), bridge width of 18 $\text{mm}$, temple arm length of 140 $\text{mm}$, and fit classification Standard / Medium Frame.

Europe Size 56-21-150: Corresponds to a lens width baseline of 56 $\text{mm}$ (2.2 $\text{in}$), bridge width of 21 $\text{mm}$, temple arm length of 150 $\text{mm}$, and fit classification Extra Wide / Oversized Frame.