Keep feet warm and toasty with the Acorn Men's Sheepskin Removable Insole. This 100% authentic sheepskin insole fits seamlessly into any Acorn slipper with a removable insole. The thick and plush premium grade sheepskin has a flexible EVA base layer and a contoured arch for supreme support and improved comfort. The extra layer of four-season, naturally temperature regulating warmth adds an unmatched comfort experience for your feet.