Goldwell Style Sign Straight Sleek Perfection Thermal Spray Serum Fine mist, waterless spray-on serum for a silky-straight look that lasts. Speeds up the straightening process. Humidity resistant for up to 24 hours. With Thermo-Protect formula and color protection. Use: Spray onto dry hair before using a straightening tool. Product Options Available are as follows: Size : 3.3 oz - Goldwell Style Sign Straight Sleek Perfection Thermal Spray Serum; Option: 3.3 oz - Goldwell Style Sign Straight Sleek Perfection Thermal Spray Serum;