The Czech brand Pegres offers beautiful barefoot slippers with a sufficiently wide space in footwear toebox. The sole is very flexible, the heel is slightly reinforced.
They are suitable for so called "fin" foot type, for a dominant toe, slightly narrower heel. They come with a removable thin insole without arch support.
Material:
Upper - textile
Lining - textile
Sole - 3mm rubber
Inner length of footwear in mm (measured with Plus 12 gauge) and width in mm (measured with Clevermess gauge):
24: 154 / 67
25: 159 / 68
26: 166 / 70
27: 173 / 71
28: 180 / 72
29: 186 / 74
30: 193 / 76
31: 200 / 78
32: 207 / 80