The TheraTogs ULTRA Lower Extremity System, models GLE201, GLE301, GLE401, GLE601, GLE611, GLE621, GLE701, GLE711, GLE721 AND GLE731, is a knee extension orthosis, knee ankle foot orthosis, and an above knee training orthosis system designed for use by children and adults who have alignment and functional deviations of the knee joints, developing femurs, and hip joints as well as balance, walking, neuromuscular and lower extremity disabilities. It is made with GoldTone material that has stretch, tension and rebound properties specifically formulated for the demands of biomechanical retraining and support. This support system is a pants-like garment that extends from the waist to the ankles with openings around the knee. One or more alignment straps that attach with Velcro adjust its fit. SIZES: Children –Preschool, Pediatric; Adult Female – Petite, Small, Medium, Large; Adult Male – Small, Medium, Large, X-Large.