The circumference of the head should be measured with a cloth measuring tape at a point just above the eyebrows, around the ears, and at a point in the back of the head that results in the largest possible measurement. Take several measurements to make sure you have the largest one. Compare to the size chart below. If you are in between sizes, better to choose the larger size.

The cheek pads should be in contact with the cheeks with a snug fit but without excessive pressure. Look for gaps between the temples and the brow pad. After this, check movement of the helmet up and down and side to side. As you test the movement, the helmet padding should not slide easily over the skin, but rather, should pull the skin in the direction of rotation. A proper-fitting helmet will feel snug with fairly even pressure around the sides and top of your head.