From Rothy's, The Merino Wool Casual Clogs feature: Upper is a blend of RWS-certified merino wool and Rhothy's signature thread, which is made from recycled plastic bottles V topline construction Slip on styling Unlined Plush, contoured footbed Durable tortoise shell rubber outsole Imported. Styling Notes: Machine Washable: Toss in the wash. Air dry. Runs big. If you are in between sizes, we recommend sizing down for a better fit.