This Kombat Kids Explorer / Avaiator Hat measures 54cm has a faux Leather outer with chin strap.  Super soft faux fur lining for warmth and comfort on the coldest of days.
 
The chinstrap keeps the hat securely fastened in cold and windy conditions, helping to retain heat.
 
Both ear flaps can be buttoned up if you do not require sides of your face to be protected or fastened down to give extra warmth over the ears.