Bosley Professional Strength Bos Defense Volumizing Conditioner Color Treated Hair 33.8ozBosley Professional Strength BosDefense is formulated for those who want to take a more "defensive" action against thinning hair. Bosley formulas contain anti-aging ingredients and DHT inhibitors. BosDefense Volumizing Conditioner for Color-Treated Hair is a daily conditioner for the hair and scalp that infuses body and shine. Hair is thicker looking and has more volume. Kelp extract helps protect from photo-aging, frequent washing and damage due to brushing.