The Rolyan Functional Position Hand Splint is made of pre-formed 1/8" Polyform splinting material, which is latex free. The splint comes preformed, but can be modified for a custom fit; please see the attached PDF for instructions. Use the size chart above as a reference then choose between left or right orientation and small, medium, or large sizes, depending on your specific needs. Rolyan also offers this same splint with straps included here.