This is the mainstay product of the majority of professional and recreational mushers. Most commonly seen on pictures of sled dogs around the globe, this harness is the traditional style of capturing a dogs pulling power. It is important the harness fits snugly but not tightly around the neck and extends along the back stopping just short of the tail. As well as sledding and dryland mushing, this harness can be used for skijoring, bikejoring, cani-cross and scootering. The X-back harness when used correctly captures the complete power of the dog from the shoulders through to the back legs. A variation of the standard X-back Harness is the Weightpull or Freighting Harness; this is a longer harness and incorporates a spreader bar at the back which sits just behind the dogs back legs, reducing unnecessary pressure on the hips when the dog is pulling a heavy load. - See more at: http://www.snowpawstore.com/a-guide-to-working-equipment#sthash.l9pfPTwV.dpuf