Superior support and cushioning, plus a breathable mesh lining, make this a reliable choice for working or riding. But what really sets it apart is the back zipper, which makes it easier to get into and fits a wide range of calves. Round Up Back Zip Western Boot Product Features : 0 : ATS® technology provides ergonomic support on uneven terrain, 1 : Removable All Day Cushioning insole, 2 : Duratread™ sole provides maximum wear resistance, 3 : Double stitch welt construction, 4 : Five-row stitch pattern with embroidery, 5 : Full back zip with gusset Women's Round Up Back Zip Western Boots in Desert Sand, Size: 5.5 B Medium by Ariat