I was hesitant to purchase these for my youngest son. However, his room is over the garage and it stays colder than any other room in the house. Normally, I buy flannel sheets every year. From reviews of Microfleece sheets, I only purched one set to try. After washing, they did not have fur balls. After sleeping in them, no fur balls. My son says it keeps him warm. Said he could imagine what it would be like to sleep in Heaven. After that, I crawled in his bed. WOW. I ordered a set for me and my husband and a set for my daughter.