Thikk Washs weightless formulation effectively boosts volume in fine to medium hair by using an abundance of body building pantheon, keratin and silk proteins. The result is soft hair with bounce and movement. Cleanse hair while creating volume and a healthier scalp with body building panthenol and our exclusive Regenerative Complex. Boosts volume in fine to medium hair, adds softness body and movement. Boosts Volume. Gently Cleanses.