Our mitten style dog boots are made of soft suede leather and are held on with velco closures. These dog boots come in a set of four, one for each paw. Size Small: Paw spread up to 3-1/2 inches. Size Medium: Paw spread 3-1/2 to 4 inches. Size Large: Paw spread 4 to 4-1/2 inches. Size X-large: Paw spread 4-1/2 to 5 inches.