Wool helps provide excellent insulation against hot and cold circumferences and also organizes the humidity in the air, thus providing perfect sleep for the user. Wool products are quite resistant to dirt and stain and can be easily cleaned.
Lemme preface this with this pillow is basically a brick with that going forward, this pillow is by far my favorite pillow ive slept on, it doesnt get too hot at night or be too cold when i go to lay on it, it doesnt deform much if not at all which is great for some but not for others who tended to say, fold a pillow or have their arm under for extra support, this pillow is the support on its own, if anything ive said so far describes something you have gotten accustomed too then id possibly steer clear or remove some of the wool from the pillow for your own needs.
If you like sleeping with your head on a concrete slab, these pillows are for you. I like a firm pillow but these have no give whatsoever. I did unzip the cover and the interior pillow and could probably remove some of the wool for a softer feel, but at this price, a do it yourself pillow is not what I was looking for.