People with fine or flat hair who want lift at the root and a lightweight cleanse, without the heavier conditioning agents that can weigh fine hair down. Not intended as a general all-hair-types shampoo.

Fine hair often goes limp fastest at the root, and conventional shampoos that pile on conditioning agents to fight frizz or dryness tend to make that worse. This shampoo's cleansing base is intentionally kept light, with the lift work handled instead by a small dose of soy protein and non-heavy styling polymers — so it cleans thoroughly without adding the residue that flattens strands. It's formulated to be paired with the matching Volume Boost Conditioner rather than used as a stand-alone daily shampoo for any hair type.

• Apply a dollop of shampoo to wet hair
• Lather
• Rinse thoroughly

Pros:

• Lightweight sulfate cleanse is formulated specifically to avoid the heavy buildup that flattens fine hair
• Soy protein and lightweight styling polymers are aimed at root lift rather than just surface coating
• Vegan, Leaping Bunny cruelty-free, and sold in a 100%-recycled bottle and cap

Cons:

• Still a sulfate-based cleanser, so it can feel slightly more drying than sulfate-free lines with very frequent use
• Relies on several synthetic fragrance allergens (limonene, linalool, hexyl cinnamal, coumarin, benzyl alcohol, amyl cinnamal)
• Single-bottle use won't replicate the brand's advertised "system-level" volume results, which are measured using the full shampoo + conditioner + root-lift routine