Moroccan tribal rugs are made of wool, sometime using cotton wefts, and goat hair exceptionnally. Whichever their thickness, they are quite supple, which explains why they cannot be rolled and left standing-up as most trade rugs from western Asia do. These qualities and their light weight dictate they be equipped of an anti-glide underlayer when resting on a wood, marble, tiles or a waxed cement floor, to prevent an accidental slide.
Anti-glide layers are to be installed underneath the entire surface of the rug, but a few centimenters on the perimeter in order not to be seen. There are several types of anti-gliding materials. The best one is a kind of a polyester grid with natural or artificial rubber coverage. It blocks itself and the rug as soon as a foot pressure is applied.