The ankle strap works for the ZhikBoot 50, ZhikBoot 200 and ZhikBoot 300, and also the Zhik wetsuits with legs. In all instances it helps to keep the water out. In the ZhikBoot however, it also plays a significant role in foot support for a more comfortable hiking position.
A quality made strap, with material backed velcro. New design with higher quality and more durable metal studs.