Shires Blenheim Leather Polo Headcollar Red/Navy. This smart headcollar is made from waxy, conker brown leather, and features polo style stitching. The headcollar has a double ended adjustable headpiece, adjustable noseband, clip-on throatlash and quality brass fittings making it fully adjustable to fit your horse or pony's head and for ease when putting it on and taking it off.