US: M to Europe Size 18
Cross-market adult bracelet and cuff apparel conversion mapping M specifications into 18.

Analyzing Size Equivalence Across Markets
US: M: Corresponds to a wrist circumference baseline of 16.5 (6.5 ), bracelet length of 18 (7.1 ), and fit classification Standard / Regular.
Europe Size 18: Corresponds to a wrist circumference baseline of 16.5 (6.5 ), bracelet length of 18 (7.1 ), and fit classification Standard / Regular.