The AM1 thruster surfboard fin set is the most trusted Al Merrick template in Thermotech construction. Made in Huntington Beach, the Thermotech product line does not have the traditional plastic feel of a composite fin. Instead, they have a consistent flex that creates drive and release through turns. Thermotech fins come with the Futures Truss Base, making them lighter and stronger.Template Category | Rake (Drawn-out | Drive). Construction | Thermotech. Ride Number | Balanced – 6.2. Size | Medium (145 – 175 lbs)