The width. These are super comfortable and they have a rubber grippy sole and not the hard professional sole. I put a pair of my husbands size 10 shoes on the shelf and they hang over a tad bit and only one pair per shelf. Aun no la uso, llego ahora y en apariencia viene en perfectas condiciones pero lo que me molesta es que venia sin empaquetar, la caja sin un solo sello de seguridad, simplemente para abrirse como si nada, no faltan piezas pero si acaso venia un recetario no lo sabré, menciono esto porque otras freidoras incluyen recetarios. It was amazing how well they worked. I might be wrong, but that’s what it seems to be doing. That said it is fine to run out to mail box, water the lawn, go to laundry room, etc. I wear FitFlop as my slippers. _____UPDATE (DECEMBER 2020)Bought another pair in another store at a reduced price in case the model gets discontinued. I have the black, wine color and just bought the khaki.