Ski and snowboard helmet sizing chart by Alpine Accessories

How to determine your helmet size.
#1- Measure around your head, just above the eyebrows staying parallel to the floor.
#2- Use a soft tape measure for best results.

Consider the following when making your selection.
#1- A snug fit will protect you better than a loose fit.
#2- If you wear a headliner, it makes your head larger.
#3- If you're between sizes, go to the larger size.

Giro adult helmets Models 540, Bevel, Encore2, SHIV, Revolver and Talon	Giro adult helmets All models not included in left column.	SIZES	Giro kids helmets	K2 Helmets
		XS / SM	49 - 52 cm 19.25 to 20.50 inches
		Universal	49 - 54 cm 19.25 - 21.25 inches
		MD / LG	52 - 55.5 cm 20.5 - 21.75 inches
52 - 53.5 cm 20.5 - 21 inches		X-SMALL
53.5 - 55.5 cm 21 - 21.75 inches	52 - 55.5 cm 20.5 - 21.75 inches	SMALL		51-55 cm 20.0 - 22.5 inches
55.5 - 57 cm 21.75 - 22.5 inches	55.5 - 59 cm 21.75 - 23 inches	MEDIUM		55-59 cm 22.5 - 23.25 inches
57 - 59 cm 22.5 - 23.25 inches	59 - 62.5 cm 23 - 24.25 inches	LARGE		58-61 cm 23.0 - 24.0 inches
59 - 60.5 cm 23.0 - 24.25 inches	62.5 - 65 cm 24.5 - 25.5 inches	X-LARGE
60 - 62.5 cm 23.5 - 24.25 inches		XX-LARGE

Helmet Sizing Chart