Cationic Hydration Interlink. CHI Helmet Head hair spray is an extra firm, fast drying hair spray for creating voluminous, full-bodied looks that last from day to night. The ultimate tool to lock in your style and give you control against wind, moisture and humidity, while adding shine. Superior for use with CHI flat or curling irons to create styles for lift, movement and texture. Not tested on animals. Made in the USA.