The Invigo Volume Booster Uplifting Concentrate is a salon-exclusive treatment that turns tired flat hair into voluminous bouncy locks. 1L. Made in USA. The Invigo Volume Booster Uplifting Concentrate contains cotton extract that bringsstability and softness to fine, flat hair. The booster is used in combination with conditioner or mask. Ideal for fine, flat, low-volume hair. Apply to clean, damp hair before applying a mask or conditioner. Leave for five minutes and rinse out thoroughly.