Nanogen Hair Thickening Fibres Medium Brown 30g is a world-renowned product designed to add volume and thickness to fine or thinning hair. These fibres are easy to apply and can effectively conceal any areas of hair thinning or scalp show-through in a matter of seconds. The product is available in 10 different shades and is perfectly safe for sensitive scalps. It doesn't clog pores or affect the effectiveness of topical treatments such as Minoxidil.