TUSA SF22 Solla fins combine TUSA's rich history of performance fin design with the latest advanced materials and hydrodynamic innovations. A completely new design, the Solla has several unique features that deliver superior propulsion, speed and maneuverability. Powered by ForcElast Technology. TUSA patented 20 Angled Blade Design (A.B.D.). Multi-compound foot pocket increases power transfer to the fin blade. Newly designed anatomic foot pocket enhances comfort. Three channel blade with crescent tip maximizes propulsion. Reinforced blade side-rails and vents fine-tune performance. Standard with Anatomic Fin Strap (A.F.S.). TUSA patented EZ Strap and buckle system.