Fibre can be described as microfibre when it weighs less than 1 gram per 10km of length. For most microfibres, this equates to a diameter of less than 0.12 denier. To give you an idea, this is 100 times thinner than a human hair. Microfibre is made from a mixture of polyester and polyamide bi-component fibre. It is split into many micro-segments by special physical & chemical treatments.