How to buy helmets

Buy helmets as the purchase of shoes， size is very important. If the election will cause a small head discomfort， the summer will be very hot， too big and easy to fall off， not the role of security protection. So we have to choose according to their own head around a suitable helmet. A suitable helmet， wearing will be comfortable. The most important size when buying helmets is the head size.

Neonatal head circumference average 34cm， about half an increase of 8-10cm in the first half， about half a year after the increase of 2-4cm， 2 years old when about 46-48cm; the second year only increased 2cm， 5 years old about 50cm， 15 years old close to adult head Wai Adult head about 54-61cm.