It uses a bag-like sheet that it blows air into, to adjust temperature. For women suffering* through menopause, being able to adjust around hot/cold flushes is sanity-preserving!
* Some women don't suffer much during perimenopause or menopause, but it's a process that seriously fucks with one's hormones. A word of advice to any partner of a woman going through perimenopause: believe them when they tell you what they're going through! So many partners don't realize just how much this can mess up someone, they deserve every sympathy possible.