Bort 105400 Sella Dur Thumb Brace, Rigid Thumb Splint with Thumb Undersleeve, Arthritis Thumb Sprain Splint Treatment, CMC Basal Joint Immobilizer, Waterproof, Orthopedic (Left Small, 5.9″ - 6.7″ inches ) ... All the features of this thumb splint are aimed at user comfort, making it one of the best thumb splints for arthritis and more. The brace for arthritis in the thumb (AKA thumb rhizarthrosis) immobilizes and protects the metacarpophalangeal and thumb saddle joint. This makes the arthritis thumb splint ideal for sprains or skiers' thumb pain, too. The thumb joint immobilizer is made of tough plastic that protects these joints. The material is perforated, enhancing the breathability of the support for the thumb joint-thumb arthritis treatment shouldn't be a sweaty affair. The arthritis thumb splint has a raised edge at the thumb/forefinger juncture to avoid pressure points some hand braces for arthritis cause. This thumb sprain splint comes with a soft black undersock so the hand support for arthritis isn't irritating. The brace for sprained thumb care, saddle joint arthritis, etc. leaves the fingers free. This treatment for thumb arthritis also has an arthritis-friendly Velcro closure.