The Wrist Support allows full finger movement meaning it's particularly useful during work related activities. Please measure around the top of your wrist Choose left or right wrist. Small 18cm Medium 21cm Large 23cm Can reduce patient pain When used to tighten the buckle suitably, guarantees the fixed effect This Listing includes: 1 x Top Quality Breathable Carpal Tunnel Splint Wrist Support Brace Arthritis Sprain