I wore my own mukluks so often this winter! It's cold underfoot where we usually sit at our breakfast table with our laptops, because we have a tile floor. I just like to have my feet quite warm. (People do ask for this pattern - it was part of my Strings to Things seminar, and it was based on the lined slipper in Footnotes. it isn't published separately from that USB at this time. I may do it later, but it's not done yet.)
I realized I was going to wear through the slippers, and before that happens, I wanted to put some sort of sole on them.
I purchased these suede heels and toes from theknittingcloset.com. I used some black yarn that has nylon on it to stitch them onto the slipper. The soles came with some black yarn for sewing, but I used my yarn instead because I knew it would be strong. I used two strands and I pulled it through with a rubber "finger cot," one of those gummy thimbles people use in offices. I bought a box of them years ago, and they've lasted all this time and still grip a needle.
So here's my review: They're nicely non-slip. My soles were size "large," and I have a size 8 foot. Large was a good choice since these mukluks are Group 4 yarn and lined with Group 4 yarn, therefore, they're not small foot bottoms. The suede pieces are pre-punched, but the holes aren't very big, so expect to tug. It was easy to keep them in position with just a couple sewing pins, since you can slip pins into the holes.
My only real complaint is I wish they'd come with gray yarn to match.
Standing in them, I can feel them a little, but it's not an issue since my slippers are double-thickness. You would certainly feel them through a thin slipper.