Genuine leather sole dog boots. Flexible leather soles feature extra toe protection, self-tightening Velcro straps, Water resistant exterior nylon and stretchy leg cuff. Machine washable. To measure, place your dogs front paw on a piece of paper ensuring that their full weight is on the paw. Measure from the tip of the nails to the back of the paw. Sizing: fits paws 3.75in - 4.25in.