A splint immobilizes a proximal interphalangeal (PIP) joint of a finger while allowing a distal interphalangeal (DIP) joint to be flexed. The splint may include a splint body and straps configured to secure the splint body to the finger. The splint body may have a size to fit the finger, a shape to generally conform to and partially surround the finger from the palmar side, and a length to extend from a proximal phalanx of the finger across the PIP joint to a middle phalanx of the finger without extending across the DIP joint. The splint body may have an integrally-formed periphery defining a central opening. The periphery may include a first base at the proximal phalanx, a second base at the middle phalanx, and opposing sides extending between the first and second bases.