Our standard 360 Lace Frontal Band is for individual with a medium size head that circumference measures 22.5". If the head is smaller or larger an option for the unit to fit securely would be to use the Elastic Band or the Adjustable Straps. (Those with a medium size head can also choose these options as well). Below are pictures of all of the options we offer for our 360 Lace Frontal Band.