The SF0114 Solla B combines TUSAs rich history of performance fin design with the latest advanced materials and hydrodynamic innovations. The updated Solla has several unique features that deliver superior propulsion, speed and manoeuvrability. The Universal Bungee Strap is adjustable, and one-size fits all. Its comfort-flex hinge, and rubber heel cup with a finger loop make for an easy fit. All of the same great features of the original SF22 updated with a comfortable Bungee Strap TA0915A. Three material composite the maximizes the flowing form design and propulsion. ForceElast structure with dual ribs for optimum propulsion. Concave shape at the tip of the blade that stabilizes the water flow with the smooth blade. Stiffer material on the top of the toe and bottom of the heel to reduce power loss when kicking. Features ForcElast. Angled Blade Design (A.B.D.) Adjustable Bungee Strap. Anatomic Fin Strap.