Love these slippers - they keep my feet warm but without overheating, and comfy for walking around on hard floors.
I bought these to replace a pair of Acorn Chincilla bootie slippers because the booties were TOO warm and made my ankles hot. I love the Chincilla interior, it's very soft and plush. The exterior looks/feels like boiled wool (or a synthetic version of it) - very dense fibers. The tag said the insole has memory foam - I was skeptical b/c my old ones didn't (or at least didn't feel like they did), but these do indeed feel like there is memory foam in there. Very cushy, and especially pleasant for walking around on our hard tile and wood floors. Soles are rubber and sturdy without being stiff either.