Very warm since they have a lot of fibers in the lining. Assuming those are synthetic. But the sole isn’t very supportive. If you’re thinking it’s a hybrid slip/shoe for walking out to get the mail, it’s not. It’s a true slipper. Very lightweight which is nice but the build on mine were a bit off. The left one kept looking like I was walking on the outside of my foot. Then I realized it was stitched non-symmetrical. Outside fabric isn’t suede or leather. It looks like it might be suede but it’s not. As I said, not a "bad” buy but not the quality I expected. I’ll return and pay more for higher quality.
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