Silk filled, that sounds really nice. So far, Rog is roasting and I am okay at first, then wake up freezing in the middle of the night and drag on a small extra blanket, not too heavy, which covers my legs and feet. It's mostly my feet. I just wear my Birks as slippers. As cold as it is at night, I am going to have to get a pair of real slippers to keep my feet warm when I get up.:-)