These mens slip on style slippers are made from 100% re-purposed wool . It has been felted down as far as it will shrink.  So you can toss these in the washer and drier.  The interior is soft and comfy fleece made of 100% polyester.  The Ultra Suede soles help prevent sliding on those smooth surfaces you have in your home and can be worn outdoors if its dry Washing instructions: machine wash cold tumble dry.  If you do need a little extra tightness, put in a hotter drier for a few minutes