Nanogen fibres hair thickening dark brown can give you an instant look of fuller hair its ultra fine hair fibres bind to your hair for instant hair thickening and hair volumising developed with pure keratin which is just like your hair it is safe to use on your scalp stays all day long its patented technology helps hair fibres stick to your hair using static electricity meaning that the fibres stay in place all day long through rain perspiration or wind unique features 10 shades to