Tame unruly hair with the Biolage Spa SmoothProof Duo, a professional-grade shampoo and conditioner set designed to combat frizz and restore smoothness. This 33.8 fl oz collection harnesses advanced smoothing technology to transform coarse, rebellious strands into silky, manageable locks. The shampoo gently cleanses while the conditioner seals the cuticle, locking in moisture and creating a protective barrier against humidity and environmental stressors. Perfect for anyone battling frizz, this salon-quality system delivers salon results at home, leaving your hair visibly smoother, shinier, and more controllable with every wash.