Place a yoga strap around the arch of your left foot, holding the ends of the strap in both hands. (sleep.org)
You can adjust the length of the strap as needed, up to about 12 inches. (babypreppers.com)
It's completely wind resistant because of the straps on the sides to increase security and it's backed by a 6 month warranty and a 30 day money back guarantee. (geekwrapped.com)