* Thruster fin set (3-Fin) * Recommended for Medium Size Surfers - 145lbs to 195lbs (65kg to 88kg) * Futures Ride Number rating of 4.0 - Speed Control * Solid and engaged, holding you in the face of the wave * Larger, more drivey version of the F4 template,  * Techflex construction and flat foil This thruster fins is designed with a larger size and a more drivey version of the F4 template which also gives a an additional base and rake. Its Techflex construction and flat foil offers a stable feel and gives you more control on powerful waves.