The Sure Grip is a hypoallergenic comfort liner designed to cushion and comfort. Perfect for sensitive scalps, the Sure Grip will relieve pressure points around your head, preventing pressure headaches caused by extended wear or improper fit, while securing your wig in place for a reliable fit. The Sure Grip is easy to clean, self-healing if punctured, and non-allergenic. The Velcro® adjustment fits up to 24" circumference.