Griffin NuuMed HiWither Half Lined Wool GP Numnah in White. The HiWither Half Lined GP Numnah is a smart, light weight and hard wearing numnah that is ideal for everyday use and competition wear. The Half Lined Wool Numnah features Lightweight wool over the horse's key pressure points and offers good levels of protection, while allowing the rider close leg contact. The Light weight Wool is a less densely woven wool that creates a soft, lighter weight finish and is trimmed to approx 1 in length. Read more… The Numnah offers a polycotton drill 5oz light weight quilt in a high wither design that is shaped to contour to your horse's back. The Numnah features long straps and girth loops.