The Bort SellaDur Thumb Arthritis Treatment Splint helps to immobilize the thumb saddle or metacarpophalangeal joint. 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 immobilizes and protects thumb and joint from further injury. This makes the arthritis thumb splint ideal for sprains, skier's thumb pain, and other injuries where partial immobilization is needed. The thumb joint immobilizer is made of tough thermoplastic material that protects and supports the thumb joint. This material is extremely durable, but can be cut with scissors and reshaped using heat. It is also perforated with holes, which helps to enhance the breathability of the thumb support. The arthritis thumb splint has a raised edge at the thumb/forefinger juncture to avoid pressure points some hand braces for arthritis cause. For additional comfort, this thumb sprain splint comes with a soft black undersock, which is also machine washable. The soft material helps so the hand support isnÃt irritating by rubbing or chaffing against the skin. Another great feature of this sprained thumb brace is that it leaves other fingers free for motion. This treatment brace for thumb arthritis is simple to apply and easy to adjust using the Velcro strap. It is available in three different sizes: Small, Medium, and Large. To determine what size you need, measure the distance around your Interphalangeal (IP) Joint and refer to the sizing chart.