Characteristics of Wrist/Thumb Splint Really easy to put on, this wrist/thumb splint provides optimal comfort. To be used for rhizarthrosis, metacarpophalangeal sprain (MCP), thumb joint and ligament injuries. One size for either the right or left hand, upper wrists circumference 14cm. How to put on the wrist/thumb splint There are two sides: a modular side and a detachable palm section (to be put on the right hand: in the part marked with 1 stick or left in the part marked with 2 sticks) Lay it out flat, fasten the neo rhizo splint on the damaged wrist, putting your thumb through the gap provided. Then position the strap taking care to tighten the strap and secure with velcro. Wrap the main strap around the wrist adjusting the tightening then attach onto the velcro. If necessary you can change the palm section to the shape of your wrists then follow the instructions. Materials Exterior: 95% nylon + 5% spandex. Interior cushioning: 100% chloroprene Interior: 100% polyamide Splint: Aluminium