Once you have the visor to the shape and fit you want, its time to bring in the velcro. Cut into lengths and widths to fit inconspicously on the helmet, put the "scratchy" side of the velcro on the helmet, this is so that when the visor rolls up when not in use, the scratchy parts wont damage the visor, causing it to be un-see-through-able. Be generous when applying the lengths of velcro on the helmet. Cut out the soft side of the velcro now and apply it accordingly placed on the visor. An efficient way to do this is to place the visor up to the helmet and mark where the velcro will be with a dry erase marker then place the velcro where you marked.