Combining lightweight construction with purpose-driven design, the Hollis F1 LT Fin is a superlative option for tackling tight, confined dives where every kick counts. The lightweight SEBS compound is molded into a vented design for hydrodynamic kicking that offers tons of efficiency per square inch. A rigid, yet lightweight flex ups the efficiency and extends the amount of power and thrust per kick, meaning you save energy and can dive longer without becoming fatigued.