Why Wool Fibre is Called All-Weather Fibre? |Wool Fabric is Called An All-Season Fabric

Wool absorbs moisture to a greater extent than any other fibre and yields it up readily to the atmosphere. Under ordinary atmospheric conditions, wool will hold 16 — 18% of its weight of moisture. As wool absorbs water vapor (from the air or from perspiration) through the porous coating over the scales, hence wool can absorb up to 30 % of its own weight in moisture- without feeling clammy or damp. The capacity to absorb makes wool a “temperature regulator” because it can protect the body in both cold and warm conditions.

In cold conditions, wool absorbs atmospheric moisture; the hydrogen bond of water is broken and chemically reacts with molecules Of the wool to generate heat. Also when wool absorbs perspiration; thus keeps a layer of dry air next to the skin and this dry air gets entrapped between the fibre because of a natural crimp in the wool fibre. This trapped air is a bad conductor of heat, which in turn, helps to hold in body heat.

 In warm conditions, wool absorbs perspiration; thus keeps a layer of dry air next to the skin which will protect against hot weather outside. Therefore wool fabric is called an all-season fabric.