NEW Maxi Fibres Hair Building Fibres. An amazing new fibre - Textured and coloured to look like your very own natural hair. In fact it is so natural-looking that you alone will know its there! Thousands of Men and Women with thinning hair use Maxi Fibres daily with great success. Safe, Non-Toxic Keratin-Rich Concealer Fibres are Easy to Apply. Sprinkle on - Stays On - Easily washes out.