http://www.insightful-products.com/step-smart
In this Foot of the Week you will learn how to select the proper size of your Step Smart Brace and then you will be able to tell if you need a small or large brace. The Step-Smart brace for drop foot is sized by first knowing your shoe size. If you wear a USA men’s size 10 or larger, the go with a large. If smaller, then go with a small Step-Smart drop foot brace. If your heal is wider than 2.5 inches than go with a large.
http://www.insightful-products.com/products/orthotic-foot
If you have drop foot and wear an AFO on one foot, you may need to wear a foot orthotic on the other foot to help balance your gait. Most AFO’s, including the Step-Smart for drop foot treatment, add extra thickness under the dropped foot resulting in an imbalance with no extra material under the other foot. In order to level or balance both feet, an orthotic, such as OrthoticMe, can help raise the other foot to be in balance with the dropped foot.
AFO Blog 