We live in the Central Valley of California which has triple digit temps in the summer. The description on O was that the sheets were for cold climates. I was looking for warm, soft sheets for my guest bed for my 82 year old mother who was coming for a visit. She loved the sheets and said they were soft and comfortable. She lives in a tropical climate and freezes when she comes to CA to visit because we keep our AC at 78 degrees. Glad we found these sheets and so was my Mom!