At first they felt (no pun intended...) a little big. I wore them around, and they flopped all over the place. Not really what you want in cozy slippers. Like socks, slippers should hug your feet perfectly to keep them warm.
These did not. They felt like a flop to me.
So I bent the rules and threw them in the front-loading washing machine to felt them further.
Absolute success. I had to stretch them out a bit while they were still wet, but the second felting worked.
I wanted the blue layer on the outside, but even after the second felting, it kept falling off while I walked around. An hour would pass and I'd wonder why my left foot was colder than my right and then I'd find a lonely slipper on the other side of the apartment. The inside gray layer stayed on, however.
I kind of chalked it up to a bad knitting job (after all... I'm on a roll with this yarn and the sweaters...) but then I realized I could put the blue layer on the inside and the tighter gray layer could keep them on.
While these are nice slippers... I still prefer this felt clog style in the winter, simply because they cover more of my feet. These however, are great for spring or fall, I think.
Definitely not a flop!