"This dial provides up to 6cm of adjustment and enhanced stability to accommodate different size goggles and head shapes for that custom fit each and every time that they wear this stylish, graphic, high performance helmet. There are also super cool vents to allow for the fresh air to be pulled into this helmet while letting the heat and stale air escape. These 4 super cool vents help them to regulate their own temperature and keep them feeling and smelling fresher as the day progresses. Now your child can have a soft and cozy interior for high comfort, along with great style with the latest technologies all wrapped up into this one Slingshot Ski Helmet. In Form Fit System 4 Super Cool Vents Soft and Cozy Interior"