Utilizing nature's Wing Technology, the Trek Fin produces optimum forward motion with minimal effort. Manufactured from an exclusive next generation thermo-plastic - Duoprene - blending the best characteristics of rubber and plastic to provide the Trek split fin unsurpassed performance.

APPROXIMATE SIZING GUIDE
Fin size Small - Fits Mens shoe size 4-8
Fin size Regular - Fits Mens shoe size 9-10
Fin size XL - Fits Mens shoe size 11-13