Customized Metal Insert: Imbedded, contoured metal insert offers custom fit. The metal strip can make the product fit the root of the thumb perfectly, it immobilizes the joint by stabilizing the thumb CMC joint without impeding other joints, while still allowing full movement of the hand and wrist. Two-color Molding: The main part adopts high-strength plastic material to provide good support. The edge is wrapped by soft rubber, which does not scratch the skin. Lightweight and waterproof, and provides long term durability, resisting abrasion. More Comfortable and Thoughtful: The Thumb Brace will come with a high elastic thumb sleeve and 2 replaceable and adjustable straps. The thumb sleeve can prevent direct contact between the product and the skin, absorb sweat and breathe, and prevent abrasions. It can also be used alone when the thumb just needs low-strength support. Easy to put on and take off, it can be worn during work, entertainment and leisure. You can even wear it under a glove and in water. Suitable for Most People: This Thumb Support is used for Osteoarthritis of the first CMC joint, Instability of the first CMC joint, Rhizarthrosis, Arthroplasty of the first CMC joint and Post-surgical recovery of the first CMC joint. Note: If the injured area is swollen, please wear it after the swelling disappears. Colour:Skin Color Material:TPE+nylon type:Left/Right Size:M/L Package Contents: 1 x carpal tunnels relief Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.