Malleable palmar and dorsal aluminum stays are easily bent to immobilize the patient's hand in the desired position;Molded plastic clamshell design protects and supports the fourth and fifth metacarpals without restricting the flexion of the MP joints;Polypropylene felt liner provides superb padding and allows moisture to evaporate away from the skin;Metacarpal closure strap features our patented V-Strap Retention System that prevents the strap from sliding out of the plastic buckle when applying or removing the splint;US manufacturing: higher quality control standards