Every year 2 billion kilos of wool are produced throughout the world. The most valuable type(s) of wool come from the fleeces of Merino sheep sheared every year; the fleeces comprise very fine curly fibres and are used exclusively for clothing.

The most valuable wool is defined superfine and comprises just 15% of annual production. Its average fineness is less than 19.5 microns, i.e. thousands of a millimetre.

The characteristic that makes wool an extraordinary product that has been used for clothing for thousands of years is its thermal insulation power. The fabric thickness stops heat exchange between the two sides. If all the fibres from 1 kg of Merino wool were laid on a flat surface they would cover an area of 200 m². This gives an idea of how much air wool cloth can hold. It is this large amount of air held in the spaces between the fibres that stops thermal conductivity and allows the body to be fresh in summer and warm in winter.