BOSLEY - Bosvolumize Thickening Fibers Medium Brown 12 g

What they are: Keratin fibres that bond together to cover fine or thinning areas for instantly thicker, more abundant hair! What they do: These hair thickening fibres are made with keratin protein similar to natural hair. They bond with natural hair to add density and help create hair that seems thicker and more abundant.

Perfect for touch-ups between hair color applications. Made of keratin protein. Easy application.