Sturdy shoe, square profile and reinforced edges. All of this will amaze you when it comes to diving fins that are surprisingly light like the Seac F1 which, is just 730 grams. All the quality and research of underwater performance typical of the Seac brand has been incorporated into the Seac F1 Fin. Although designed for recreational use, the Seac F1 fins offer many qualities usually reserved for professional fins. The Seac F1 diving fins have a blade designed to reduce the diver's effort to a minimum and release an unprecedented thrust for such a lightweight fin. The Ultra Flex technopolymers network combines the rigid sections of the blade to guarantee flexibility, ease of return of the fin and therefore less effort. This special structure then has a high degree of impact resistance, even at low temperatures, and the protection from the ribs avoid abrasions. The shoe has been created with a combination of polymers to stabilize the fit and has a practical non-slip sole with raised rubber profiles. Seac F1 fins are available in 4 sizes, to fit from 34 to 45, and in 3 colors: black, red / black and black / blue.