This slipper has a nice snug fit and is really stretchy (because of the “rolls”). It is described in 3 sizes.
I used a special durable yarn for the soles, so they will last a little bit longer.
I also used 2 strands of yarn held together and a “smaller needle” to knit with, so the slippers give/hold more warmth.
The slipper is knitted flat. Top down.
And you can mix and match yarn, as long as you meet the stitch gauge.
I have measurements in the pattern, so if your row gauge is a bit off, that should not be a problem.

I also used Wool-Ease Tonal for a couple, only 1 strand, and it works out beautiful!!