How do I know what size ski helmet my child needs?

Measure your child's head circumference with a soft tape measure wrapped around the widest part of the head, just above the eyebrows and ears. Compare this measurement to the manufacturer's size chart, as sizing varies between brands. The helmet should fit snugly without pressure points and should not shift when the child shakes their head. If between sizes, choose the size that fits without relying on the adjustment system to compensate — the dial or pads should fine-tune the fit, not create it.