The SF-22 Solla combines 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.  Features: Powered by ForcElast TechnologyTUSA patented 20° Angled Blade Design (A.B.D.)Multi-compound foot pocket increases power transfer to the fin bladeNewly designed anatomic foot pocket enhances comfortThree channel blade with crescent tip maximizes propulsionReinforced blade side-rails and vents fine-tune performanceStandard with Anatomic Fin Strap (A.F.S.)TUSA patented EZ Strap and buckle systemTechnology:Anatomic Fin Strap: The AFS is anatomically shaped to offer a balance of flexibility and control to increase comfort, power transfer and to significantly reduce heel slippage found in many standard flat fin straps.Angled Blade Design (A.B.D.): The Angled Blade Design accommodates for this anatomical characteristic and ensures maximum efficiency throughout the kicking cycle.Ez Strap And Buckle System: TUSA’s EZ strap and Buckle System allows fins to be quickly and easily adjusted with minimal effort. Adjustment can be made while the fins are worn, allowing for a precise fit and ease of removal when necessary.Forcelast: A proprietary thermoplastic elastomer (TPE) compound precisely positioned in an advanced blade and foot pocket structure. ForcElast provides superior propulsion, efficiency and speed even with moderate power input. Sizes: XS, S, M, L-XL XSSM L- XL Length mm 555576597618 Weight grams 1550163018651975 UK 3-55-7 7- 10 10- 14 Euro 34- 38 38- 40 40- 44 44- 50 CM 22- 24 24- 26 26- 28 28- 32 Male US 3-5 5-7 7- 10 10- 14 Female US 45- 6.5 6.5- 8.5 8.5- 12 12- 15