MEL-UM. This open-back slipper for women combines padded fabric and felt to match. The sole is flat, 0.5 cm thick and made of rubber. It has a removable insole with a 1.5 cm wedge in the heel area, giving the foot a total height of 2 cm. This model fits the usual size; choose a larger size if you are between two numbers. It is not advisable to wash the slippers in the washing machine.