The Epitact Thumb Support was developed for people suffering from pain in the trapeziometacarpal joint of the thumb, often caused by rhizarthrosis or repetitive strain. Its flexible structure stabilizes the joint, keeping the thumb in a functional resting position and reducing the movements responsible for pain, without limiting the mobility of the other fingers. Thanks to the EPITHELIUMFLEX® tendon integrated into the orthosis, a slight separation is created between the thumb and index finger, helping to reduce pressure on the joint and preserve local heat, providing a natural analgesic effect. This technology allows you to continue writing, driving, using your mobile phone or performing other daily tasks with greater comfort. The ultra-thin, lightweight and discreet design adapts easily under clothing and has no Velcro closures, preventing damage to clothing. The orthosis is comfortable for prolonged use and can be worn with watches or bracelets without causing discomfort. This version is for the left hand, size M, recommended for a wrist circumference between 15 and 17 cm. It is machine washable at 40°C and is designed to maintain its effectiveness for several months of normal use.