These Thanx boots by Dune have been made with a smooth leather upper and a plastic sole. The details include: a knee high design, a zip fastening to the inner foot, a slim strap with an adjustable pin buckle fastening, elasticated ankle cuffs, antique stud detail, a round toe, a stacked heel and a slim sole with a textured tread. ABOUT ME Sole: 100% Plastic. Upper part: 100% Leather