Comfortable splint provides direct support for the thumb CMC joint while allowing full finger function - The same CMC thumb wrap-around orthosis as the Comfort Cool® CMC Restriction Splint, but with the addition of a firm, moldable insert inside the thumb strap. Microwave the thumb strap to soften the thermoplastic insert, and then mold it to fit precisely along the thenar eminence crease. Thumb strap helps to abduct and stabilize the first metacarpal and open the thumb web space. Ideal for treating thumb deformity and contractures due to neurological conditions, median nerve injuries or arthritis, especially where the thumb is held abducted against the palm. Plus sizes are a half size bigger in the hand and a full size larger in thumb circumference to accommodate enlarged thumb conditions. TO size, measure MP circumference.