Wool is frequently recommended as a temperature-regulating bedding material. The claim is that it keeps you warm when cold and cool when warm. For hot sleepers this sounds ideal. Here is whether it actually delivers.
The Case for Wool
Wool has genuinely good moisture-wicking properties. It can absorb up to 30% of its weight in moisture before feeling wet, which means it draws sweat away from your skin effectively. Wool is also naturally breathable and does not retain heat the way polyester does. These are real advantages over standard comforters for hot sleepers.
The Honest Limitation
Wool is temperature-regulating relative to other insulating materials. It is not thermally conductive in the way nylon cooling fiber is. Wool insulates and then wicks moisture as the insulation causes sweating. It does not actively draw heat away from your skin the way a high Q-Max nylon blanket does. For mild hot sleepers wool is a genuine improvement over standard down or polyester comforters. For significant hot sleepers it addresses the moisture problem better than alternatives but still insulates more than you need.
The Price Factor
Quality wool comforters are expensive, typically $150-400 for a queen size. At this price point you are paying significantly more than a nylon cooling blanket that outperforms wool for pure cooling effect.
Who Wool Works Best For
Mild hot sleepers who want a natural material option and particularly those who sweat but are not extremely warm. The moisture management is genuinely good. For significant hot sleepers who primarily need cooling rather than moisture management a nylon cooling blanket is more effective at a lower price. See The Cloud here.