Decibel is a three-step volume system built around one technology, the 140dB Complex. Each step does a different job, and together they are designed to make fine, flat hair look thicker and fuller.
Step 1: Thickening Shampoo
A sulfate-free cleanse that helps soothe the scalp. Leave the lather on for two minutes before rinsing for best results. Shop Thickening Shampoo.
Step 2: Hypertrophy Treatment
The heart of the system: a progressive, no-build-up rinse-out treatment. Decibel reports its ingredients have been shown to increase thickness and volume by up to 74%, lasting 20+ washes. Leave on for five minutes. Shop Hypertrophy Treatment.
Step 3: Thickening Conditioner
A lightweight cream that hydrates without weighing hair down and adds body and density. Shop Thickening Conditioner.
Save with the duo
The Shampoo and Conditioner Duo pairs steps 1 and 3 at the same size for 2.5% less than buying them separately.
Which size?
The 296 ml bottles (236 ml treatment) suit home use; the 950 ml salon sizes (592 ml treatment) suit heavy users and salons.
FAQ
Is it safe for coloured hair?
Yes, all three steps are colour-safe and sulfate-free.
Will it weigh my hair down?
The system is designed to add body without build-up.