The X-stream fins performance, comfort and lightweight design are the incredible result of sixty passionate years at the service of diving. The X-stream fins is truly a leap into the future, and changes forever how we envision the creation of a fi n. More than 2 years of resources, experiments and testing and four Mares patents all concentrated in one unique product.Product Details Code: 410019 Colors: yl, bl, rd, tbk, wh, jpk Sizes: S-R-XL Blade: 37cm Material: Thermoplastic Rubber/Technopolymers