Sizing is different from the Yucca Shortblade. Please reference the sizing guide. Introducing the Yucca Longblades: the culmination of two years of research and development. Designed with the invaluable insights of Wedge surfer and professional lifeguard Tim Burnham, our Standard Flex Longblade sets a new standard for swim fins. Engineered to excel in the most challenging surf conditions and critical rescue situations, this fin leaves no room for compromise. With a focus on performace and durability, the Yucca Longblades are your ultimate companion for those heavy surf days and lifesaving situations. Embark on a journey with a swim fin crafted for the most demanding adventures. Not sure what FIN FLEX is right for you?Watch this video. ① Standard FlexThrust ★★★★Feel ★☆☆☆ ② Soft FlexThrust ★★★☆Feel ★★☆☆ ③ Super FlexThrust ★★☆☆Feel ★★★☆ ④ Ultra Soft FlexThrust ★☆☆☆Feel ★★★★ SHOE SIZE TO FIN SIZE GUIDE LONGBLADE SIZE MEN WOMEN M 7-8 9-10 ML 9-10 11-12 L 11-12 13-14 XL 13-14 15-16