Size Guide:
Youth Small: 49-50 CM / 19.15-19.51 Inches;
Youth Medium: 51-52 CM / 20.10-20.45 Inches;
Youth Large: 53-54 CM / 20.87-21.26 Inches;
Youth X-Large: 55-56 CM / 21.65-22.05 Inches;
Step 1: Measure the circumfererence of your head.
Step 2: Put measuring tape above ears and slightly above eyebrows.
Step 3: Wrap around just below the crown on the back of your head.