US: M to Europe Size 36-38
Cross-market adult neck gaiter, snow gaiter, winter gaiter, and face shield apparel conversion mapping M specifications into 36-38.

Analyzing Size Equivalence Across Markets
US: M: Corresponds to a neck/face circumference baseline of 38 (15 ), vertical height coverage of 25 (9.8 ), and fit type Standard / Regular.
Europe Size 36-38: Corresponds to a neck/face circumference baseline of 34 (13.4 ), vertical height coverage of 22 (8.7 ), and fit type Snug / Form-Fitting.