The Crackle is a trickster what you see and what you feel is different. This gives the illusion of pom poms and a knitted upper but is in fact a soft luxurious textile that has been used along with fleece trims to hold the heat and allow for more comfort. The slippers should be washed in a pillowcase and washed at 30 degrees and allow to dry naturally. Do not tumble dry or force dry and this will misshape the slipper and damage the textile upper.