My first pair of Haflingers were brilliant:  comfy, fit perfectly.  However, my most recent pair always feels as if something is obstructing inside.  When I take off one of my shoes to remedy the discomfort, it's the felt from the inside of the bottom of the shoe that has bunched up, and there's nothing to be done.  So I hobble around, feeling a bump on the bottom of my foot.  Secondly, the Haflinger seems to run smaller at present.  Thus, next time, if I ever buy a pair again, I will go a size up, because right now the backs are flattened down by my heels.  Finally, and perhaps most significantly, it is easy to slip and fall if the floor is just a tiny bit wet (my kitchen floor, for example.)  They do fine on carpeting, however.  I would love for them to create a slipper with better tread.  As much as I have loved Haflinger's in the past for their comfort, warmth, and reliability, I think I may search for another brand in future.  Quite disappointing.