What is the Cho-Pat Shin Splints Sleeve? The professionals choice for the treatment of shin splints symptoms. Elasticated shin & calf sleeve with upper & lower Velcro fastening straps. When can I use it? To relieve the symptoms of Shin Splints during running activities. Which size do I need? Measure circumference around the widest part of the calf. If you are between sizes, please choose the larger size. Medium 28-41cm (11-16") Large 41-51cm (16-20") How does it work? The elasticated fabric provides gentle support to the entire shin & calf region. This provides reassurance & takes the strain off the painful soft tissues of the shin. The upper & lower Velcro fasteners apply additional compression across the muscles & tendons of the lower leg, preventing them from generating their maximum contraction. This reduces the stress on the tendons themselves & the area of the shin that they attach to.