Cranial Remolding HelmetsCranial remolding orthosis (CRO or helmets) are used for the treatment of plagiocephaly. Plagiocephaly refers to a misshapen (asymmetrical) shape of the head. They are made with a hard outer shell and a foam lining with a side Velcro closure. Gentle, persistent pressure is applied to capture the natural growth of an infant's head, preventing growth in the prominent areas and encouraging growth in the flat regions. The helmet essentially provides a tight, round space for the head to grow into.