Have bought Gemmas and the like over the years and have been happy with them. After falling last winter for a trip and falling down two steps in my backless Gemma this year, I walked in full slippers in this design (didn't want to break my leg like last year) only to find they had NO arches to have . Gemmas support. They are as flat as possible. They're quite warm no doubt, but the laces don't stay tied and lead to other tripping hazards. I cut the laces and left them in knots (which also don't stay knotted). Overall it took too long to get them back so I'm sticking with them. I will not order more, very uncomfortable and put insoles in slippers?! strange.