Prevent MP joint motion. This lightweight support is made of Titex(r), a polyester web and a vinyl cover. Immobilizes the thumb MP and partially restricts CMC motion for injuries at the MP joint, post-fracture positioning and arthritis. Adjust fit by trimming with scissors. D-ring closure and a soft strap with hook and loop secure the splint. Easy donning and doffing. Hand wash in cool, soapy water and air dry. To size, measure hand width at MP joints. Size B: 2-1/4in to 2-3/4in (5.7 to 6.9cm). For left hand use.