Each wool fiber is covered with tiny scales like tiles or shingles on a roof that help shed water, rain or spills. But wool is full of contrasts and paradoxes that give it outstanding high performance for cold weather activities. The interior (called the cortex) of wool fiber can hold up to 30% of its weight in moisture without the wool fabric feeling damp or clammy, while the exterior (called the cuticle) is water repelling.
Also, when moisture enters the wool fiber, energy is released in the form of heat which helps keep the outdoor enthusiast warm. The high performance characteristics of wool help keep the wearer warm in the winter and cool in the summer by naturally maintaining a comfortable balance in the wearer's personal micro climate - that is the air between the skin and the layers of clothing. This means that in warm weather fine wool helps keep the wearer cool by transferring heat and body moisture away from the body for a naturally cooling effect.