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The F4 Thermotech is a small sized thruster in the Neutral template category
5'9" x 19 5/8" x 2 1/2" - 31
Velcro Shoulder Tab
the original template was 18” measured from leading edge to tip and was called the ‘Turn Fin’
TRUE AMES GREENOUGH 4-A FG 9.75" RED slide The F4 Thermotech is aThe Greenough 4 A Single Fin is the most iconic, functional and versatile single fin available, because it works extremely well on just about every type of surfboard. The 4 A has been True Ames' bread and butter for over 40 years now, and it is still the most popular single fin design there is due to it's all around and well balanced performance. FORM, FUNCTION & FEEL Form Medium profile, full base coupled with a tapering & moderately flexible tip