All synthetic slings must be protected from being accidentally cut by sharp edges at the load or the hook up points.
There two very different protection types available:
ABRASION PROTECTION
This is to protect the sling from abrasion against rough surfaces (load or otherwise)
CUT PROTECTION
This is to protect the sling from being cut by a sharp edge. The degree of protection varies with the sling, actual protector chosen, and sharpness of the edge itself.