Supports the CMC joint and immobilizes the thumb MCP joint. Preformed from 1/16" (1.6mm) Polyform material with 1/16" (1.6mm) Plastazote padding. Ideal for arthritis, skier's thumb and gamekeeper's thumb. Includes all necessary strapping and a 1/2" (1.3cm) self-adhesive D-ring strap to hold the thumb securely. To size, measure width from 2nd to 5th MCP. Latex free.