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For thousands of years, sheep have been able to adapt to even the harshest of environments, as their wool protects them through hot, cold, damp and dry seasons. In this time, man has also used wool for this very protective property and for the many other benefits offered by the material. Because of their crimped nature, when wool fibres are packed together, they form millions of tiny air pockets which trap air, and in turn serves to keep warmth in during winter and out in the summer.Wool's unique advantage is its breathability. That is it's ability to absorb and release moisture from the surrounding air, without compromising it's thermal efficiency. When wool fibres absorbs moisture, they generate tiny amounts of heat. This warmth acts to prevent condensation in construction cavities by maintaining the temperature above the dew-point in damp conditions. This property creates a natural buffering effect, stabilising heat changes that occur with relative humidity. Practically, this reduces the need to keep adjusting heating or cooling levels as wool insulation will keep buildings cooler during the day and warmer during the night.