Duo Redken Extreme Anti-Snap is a leave-in treatment that gently smooths the cuticle, reduces friction from brushing and helps fortify hair that's prone to breaking, splitting or snapping off. With added heat protection, Redken's exclusive Interbond Conditioning System delivers a unique 3D Repair Complex of proteins, ceramide and lipids to help provide internal strength, cuticle reinforcements and protective resurfacing.