I have 3 king-size sheets and pillow cases and they r tremendous in keeping me cool at night especially in the summer. I purchased Sheex for my daughter and her family. My son in law says they r the most comfortable sheets he has ever slept on. I also purchased the mattress cover that also helps keep u cool at night. Both of. Them together gave me a comfortable and cool night sleep especially when the humidity was high. I recommend them for everyone.