Biolage Volumeboost Shampoo & Conditioner 33.8 fl.oz DuoAchieve fuller, thicker looking hair with the Biolage Volumeboost Duo. This lightweight shampoo and conditioner set works together to add body and bounce without weighing strands down. Infused with volumizing technology, it strengthens hair from root to tip while enhancing natural texture. Perfect for fine or limp hair seeking dramatic lift and movement. The generous 33. 8 fl. oz bottles provide lasting value for your daily haircare routine.