Fabric prickliness

Prickle and skin reactions are important comfort factors related to a fabrics handle and performance. Prickle results from fibre ends on the fabric surface indenting the skin sufficiently to activate pain receptors. The handle characteristics of wool fabric isinfluenced by the fineness of the fibres in the fabric structure - the coarser the fibre the greater the chance of prickle. Fibre length is also likely to influence prickle, since it will affect the number of fibre ends per unit area of fabric surface.

Personal conclusion:

Improving the knowledge of fibres properties.

Source:

http://www.academia.edu/3052643/Comparison_of_Wool_and_Worsted_Yarn