The AligN yoga strap combines the traditional strap design of the legendary BKS Iyengar. Made with unbleached natural cotton webbing and an innovative sure-secure interlocking buckle, this strap will support and enhance your practice.The UnfoLD yoga strap has a double square ring buckle and is also made of unbleached natural cotton webbing. Slightly narrower and thinner than the more traditional AligN Strap, the Unfold strap is easy to take on the go.