Product Overview
The biased design provides motion assist power similar to traditional metal dorsi-assit ankle joints. Model 742 is delivered with 75 to 85 durometer polyurethane in three sizes. The 85 durometer models provide more assistance force than the 75 durometer models. They may be utilized in matched or unmatched durometer configurations, or even matched with free motion Tamarack Flexure Joints™ to provide the amount of motion assistance required for your patient.
(https://www.beckerorthopedic.com/Product/AnkleComponents/ThermoplasticAnkleJoints/742)