Adjustable design comfort head: length is approx. 21.5 inch, one size fits most; Perimeter can be adjusted from 16 inches to 22 inches to suit your head size Durable and comfortable: the wig grip band is made from soft velvet, good quality material make it comfortable and convenient to use and wear。 Secures objects in place: fasten your wig, hat or scarf securely without glues, tapes, clips or combs; Won't slip, slide or move even if your wig is stretched out Help prevents headaches: eliminates wig-related headaches by placing a barrier between your skull and the wig's materials, fit your head snugly