I ordered them one size up because they are narrow across the width of my foot. They should come in 1/2 sizes. The material doesn't stretch, nor are there side stretch panels, it looses its shape. I don't climb stairs in them because they are larger/longer, but they are great on a single story. I like the sole of the slipper. I would only buy them again if they came in 1/2 sizes.
St. Louis, MO