The CMC thumb splint Support aids in the treatment of arthritis and instability of the thumb CMC (carpometacarpal) joint. The unique design of the internal padded stay in combination with the outer elastic strap provides focal compression at the base of the thumb and helps stabilize the CMC joint. The CMC Thumb Support provides this functional stabilization without restricting the use of the thumb in pinching or grasping objects. Quantity: 1 Size: X-Small, Small, Medium, Large, X-Large Color: Black Material: Internal felt padded stay with comfortable poly, external hook & loop closure. Manufacturer: MedSpec Cleaning & Care: Wash in wash warm, gentle cycle. Air dry flat. Indications: Ideal for moderate to severe CMC arthritis, instability of the CMC and/or focal compression at the base of the thumb. Options: Left: X-Small (224421) UPC: 208357244218 Small (224422) UPC: 208357244225 Medium (224424) UPC: 208357244249 Large (224425) UPC: 208357244256 X-Large (224426) UPC: 208357244263 Right: X-Small (224431) UPC: 208357244317 Small (224432) UPC: 208357244324 Medium (224434) UPC: 208357244348 Large (224435) UPC: 208357244355 X-Large (224436) UPC: 208357244362 Sizing Guide: X-Small: under 5 1/2" Small: 5 1/2" - 6 1/4" Medium: 6 1/4" - 7" Large: 7" - 7 3/4" X-Large: over 7 3/4"