Some Mules, Walking Horse and standardbreds have a very exposed backbone. If the back is A-Shape and the spinous process stick up you have the have a full channel that can't be pinched.The opening in the center is 17" long. It can be cut 3" wide. Due to the enter channel wanting to close when you put it on your animal, the channel is hand-cut to keep it wide.
It takes 2-4 weeks build time for your custom ProTecTOR pad.