Dr. Marten’s Avry Sandal Adjustable buckle strap at ankle Front toe post for secure fit Hydro leather - PU-coated leather features a matte finish and is smooth to the touch. Detailed with silver trims as well as DM's signature yellow welt stitching and heel loop The Avry has a front toe post for a secure fit, is made using Hydro leather, and detailed with silver trims as well as DM's signature yellow welt stitching and heel loop.