Last year I actually had an unfortunate incident with a drink glass in the driveway while wearing my slippers near the end of summer. So I've been without slippers for months now!
I like the kind like these where you slide your feet in. I think I usually get size M (my shoe size is an 8, if that helps).
As we get more hardwood floors in the house, I figure I'll need more slippers as well. This year we pulled the carpet from Jack's room and replaced it with hardwoods, but that's just the first room on the second floor to get that fabulous treatment. Next will probably be Maggie's room or my office. I look forward to seeing it all in nice smooth hardwoods, with a cozy rug to accent right in the middle.
But I'll need snug, warm feet to walk across it all, so bring on the slippers!