How is wool a good temperature regulator?

Natural Wool is good temperature regulator - ie., known to wick away moisture better so you feel cooler when you are hot during the summer (and vice versa) - thus, more responsive to your own body temperature.
If in the past, you've felt that wool might be too 'sweaty' or 'hot' - one difference here is that with organic wool, it will temperature regulate better than conventional.
Similarly, people who have wool allergies, show less/no reactions to organic wool cause supposedly alot of the allergies are too chemicals used to treat the wool, not wool itself.