The inner material of the shoe fabric is cotton canvas.It is not a rigid material so it adapts perfectly to the foot.The sole is semi-rigid and is covered with non-slip points. Each pair individually baggedMeasure size M. 27cm long x (10 cm wide toe and 8 cm wide heel)Measure size L: 29 cm long (10cm wide toe and 8 cm wide heel), sizes 41-45