A splint for immobilizing a joint including at least one flat body that has two contact surfaces for limbs adjoining the joint to be immobilized and a supporting member in an outer contour having an angular structure for adjusting and bracing an angle between the contact surfaces for the limbs, wherein at least two surfaces are non-displaceably joined together to create a double-walled structure, and wherein a joint axis of the joint to be immobilized forms an angle of less than 60° with a normal of the non-displaceably joined surfaces.