Those with active lifestyles who need maximum ankle protection against instability and ankle pain during exercise or athletic activity for preventative and post-injury use Solid U-Shaped design relieves pressure from the ankle joint and provides superior inversion/eversion protection Bilateral hinge allows freedom of motion in plantar flexion/ dorsiflexion Documented to off load the ankle by 8.2%in gait Universal Fit - fits either left or right foot Back strap for structural integrity to prevent the scissoring effect that occurs with non-hinged braces Braces are made of polypropylene which gives it long-term wear characteristics and allows it to mold to the patients ankle anatomy after a few uses T1 sizing is determined by shoe size, carefully consider foot width to ensure proper fit Available Sizes:X Small (Women 5-6)Small (Men 5-8.5, Women 6.5-9.5)Medium (Men 9-12, Women 10-13)Large (Men 12.5-16, Women 13.5-16)