Wrist Splint And Thumb Spica Small, Left, 5 1/2"-6 1/2" Wrist Circumference. Helps protect wrist and thumb following injury. Helps decrease pain and inflammation from tendinitis. Also helps arthritis. Cotton/polyester construction with soft, cotton liner. Two metal stays support wrist and thumb. Adjustable aluminum wrist support bar. Helps protect wrist and thumb from following injury, helps decrease pain and inflammation from tendinitis, cotton/polyester construction with soft, cotton liner.