Wig caps, the foundation for wig construction, are sewn onto. They are made of stretchy fabric with an elastic band for the head circumference. These are sourced from a wig maker in the Philippines. Due to old stock, some may have degraded elastic or stains. The cap is constructed in three parts: center and two sides. While it's difficult to use a small cap for a larger one, it's safer to choose a slightly larger cap because the size can shrink during sewing.