The Shark Fin Swimfin is revolutionizing the world of swimming aids and is rapidly gaining popularity. Thanks to Swimfin, children achieve a horizontal position in the water without hindering the movement of their arms and legs. The deeper Swimfin is submerged, the more buoyancy it provides to keep the child in a horizontal swimming position. When the fin rises slowly out of the water, it offers just enough buoyancy as needed. In a perfect floating position, the buoyancy is negligible. During vertical doggy paddling, the fin completely submerges, providing secure support, which is especially important for beginners. In conclusion, the more Swimfin emerges, the less buoyant it becomes. The unrestricted Swimfin swimming aid is suitable for both non-swimmers and advanced swimmers.