Custom-fit technology molds to your hand and thumb, providing personalized support to help relieve pain. For sprains and strains, arthritis pain and more. Easily heat activated in the microwave for a custom fit. Tri-layer technology has a rigid splint covered by a layer of ultra-plush comfort mesh. Adjustable hook-and-loop closures. Can be molded up to 5 times. One size fits most, left or right thumb. Neoprene Blend/Spandex/Thermoplastic. Contains natural rubber latex. Imported.