Activ Move EPI.SPORT Professional Epicondylitis Clasp Tennis/Golfers Elbow The lightweight, Epi-Cast is highly recommended for those suffering from either Tennis Elbow or Golfer`s Elbow. Without restricting circulation, the dual action compression Epi-Cast works to treat the lateral and/or medial epicondylitis by placing pressure on to the tendon to absorb some of the tension when the tendon receives a sudden impact. The clasp can also be used for golfer`s elbow - it just needs to be worn the other way round. Applications include : Epicondylitis , tennis elbow, muscle strains, bursitis, muscular overuse after work, sports & trauma Sizes Cirumference of arm measured 4-5cm below elbow XS 20-23cm S 23-25cm M 25-28cm L 28-30cm XL 30-34cm