Great for ball players to wear inside their gloves. The ThumSaver MP is also suitable for Gamekeeper's Thumb, Basal joint arthritis, Skier's thumb, or sprains and strains.FeaturesReduce the pain you feel when pinching or gripping small objects. This thumb splint realigns the MP joint (the middle joint) and stabilizes the base of your thumb to relieve the grinding pain of arthritis. Wearing the ThumSaver MP, you can garden, write or grasp a doorknob without pain or the fear of dropping things. Ideal for Gamekeeper's and Skier's Thumb, the ThumSaver MP is thin enough to be worn comfortably under gloves. Can be used in catcher's gloves. Felt pads are included to provide cushioning where you need it. Firm ControlSizing InformationInstructions: Measure the length from the IP joint (knuckle at the end of the thumb) to the wrist. Measure around the IP joint.SmallLength 76mm - 89mm,Circumference 63.5mm - 70mm_x000D_ Medium Length 89mm - 101.5mm,Circumference 70mm - 79.5mm_x000D_ Large Length 101.5mm - 114.5mm Circumference 79.5mm - 82.5mm_x000D_ X-Large Length 114.5mm - 127mmCircumference 82.5mm -89mm