Thermal hair product Olivia Garden Olivia Protermal Hairstyling Product. This brush is suitable for all hair types. It has a ventilated cap design that keeps the top of the brush cool, increasing ventilation for faster drying. It has increased airflow that reduces the risk of tempo drying and improves styling results. Thanks to its extremely lightweight and perfectly balanced ergonomic design to reduce wrist fatigue with una seamless, snag-free handle.