A bias binding is a type of finishing that uses a strip of fabric called bias tape to surround the raw edge of the quilt. Bias tape is made from a strip of fabric folded in halfwith the sides folded inward so that the edges of the fabric are on the inside of the fold, creating a crisp border. A bias binding is sewn by inserting the edge of the quilt into the bias tape and sewing it in place. Because the edge is thus encased in two layers of fabric, a bias binding makes a durable and polished finishing to a quilt.