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New
One-click checkout with
Key Benefits
Powerful Results
*Tested on bleached hair
2X
Volume
2X
Strength
60%
reduction in breakage
Recommended Routine
Common Questions
While both versions build hair bonds, there are key differences between our fine hair shampoo and the original. Nº.4FINE SHAMPOO is an ultra-light formula clinically proven to instantly volumize and strengthen fine hair types and all textures. Nº.4 BOND MAINTENANCE® SHAMPOO is a highly concentrated, reparative formula that hydrates and smooths while helping to prevent breakage and frizz for all hair types and textures.
Nº.4FINE SHAMPOO does not contain protein.
While both versions build hair bonds, there are key differences between our fine hair conditioner and the original. Nº.5FINE CONDITIONER is an ultra-light formula clinically proven to instantly volumize and strengthen fine hair types and all textures. Nº.5 BOND MAINTENANCE CONDITIONER is a highly concentrated, reparative formula that hydrates and smooths while helping to prevent breakage and frizz for all hair types and textures.
Nº.5FINE CONDITIONER is formulated to instantly volumize and strengthen fine hair types and must be rinsed out after application. Nº.5 BOND MAINTENANCE® CONDITIONER is formulated for strengthening and hydrating all hair types and should also be rinsed out after application. Nº.5 LEAVE-IN™ is a leave-in conditioner for all hair types seeking moisture and should be left in the hair after application.
Nº.5FINE CONDITIONER does not contain protein.