Tough-1 Miniature Poly Rope Tied Halter Best selling poly nylon rope halters are fully adjustable and designed to fit snugly on your Miniature Horse. Throat knot should touch the horse's throat latch, ropes from that knot to the crown should come up behind the jaw bone. Specifications: Sizing: Small: 27" - 29" (height) Medium: 30" - 32" (height) Large: 33" - 35" (height)