This is a lace melting band, also known as an edge wrap band, used to secure lace front wigs and lay edges smoothly. These are sold as accessories and are not usually part of the wig itself.

Purpose: The band helps keep the wig in place, melts the lace into the skin for a natural hairline, and lays down baby hair/edges

Features: They are elastic, adjustable (often with Velcro), and designed for comfort and a secure fit

Brand/Text: The band in the image features the word "LOVE" printed on it, and related products are often marketed with "Lovegold" or similar themes.