Since Unshoes have one strap that threads all the way through they are somewhat dynamic and customizable. Here is an alternative method for threading the strap:
Rather than taking the strap from the toes straight to the outside heel loop, the strap goes around the outside and through the sole where the original method ends. From there it goes up around the front of the ankle and through the inside heel loop, around the heel and through the outside loop. To fasten the end loop it around the strap that goes over the ankle and loop through the plastic slider.