Henri de Rivel(R) Pro Raised Fancy Stitched Running Martingale Attachment Most popular in the jumper ring, running martingales encourage poll flexion. The HDR Fancy Stitched Running Martingale Attachment is great for handy last-minute changes to tack. This attachment easily connects to any breastplate with an open chest ring. Fancy raised white stitching gives a traditional detail to the piece. Imported leather and stainless steel hardware provide structural integrity that riders can depend on.