The Cassidee is a new kind of knit to add to your wardrobe. With a cotton cable knit collar accented by an adjustable strap, this boot epitomizes laidback comfort and delivers it via cozy wool linings, rich leather, and a lightweight, flexible outsole. Chocolate Cotton Knit & Suede Lined With UGGpure™ 7" Shaft Height Functional Strap Nylon Binding UGGpure™ Insole Molded EVA Outsole Patent-Protected Tread Design

UK size 5

I am a size 6 and it fit perfectly when I tried on.