The Ugg Classic Crochet boot is made from a combination knit wool and polyester blend. Their popularity rose when Oprah named them as one of her 'Favorite Things' and Ugg's became a staple for most Hollywood celebrities. The Crochet boot is a good option for those that want the slouchy look since it can be pulled high or slouched, depending on your desired look. It has a sheepskin liner and structured suede heel for durability and shape. Note: These fit 1/2 size smaller for most people so order a 1/2 size up.