WARNING this bedding system does not work for everyone. I bought a mattress protector and an all seasons deluxe duvet, using the lighter half to start with, to try to combat the overheating I am suffering from at night in bed, but it did nothing to help my situation. In fact I was warmer than I had been with my 4.5tog man made duvet. On contacting the company I was told 'this was certainly a first' despite another customer reporting exactly the same problems only a month ago. Types of mattress and bedding were explored as a possible cause of the problem. Because I had not purchased a pillow, i.e 'a bedding set' - I had not realised you could mix doubles and singles in a bedding set - there was no guarantee on offer. I have my doubts as to whether a wool pillow would make a difference. My advice is before you make this expensive purchase is to talk to the company to ensure you have a suitable mattress, tell them why you are buying wool and ensure your purchase qualifies for a 30 day money back guarantee.