My Partner and I have less sweaty nights, thou we keep warm as toast we don't have the wringing wet through feelings, There's nothing worse than having to get up in the middle of the night leaving a damp bed and then having to get back in a damp bed. We bought a wool mattress cover and a wool duvet and they work. I think had I though that it would be as warm as it is I might have bought the all season duvet because now I will have to buy a summer one later on in the year. The allergy side of it I can't say there's any difference but that could be that my asthma isn't really under control at the moment we will see in the future.