The Zoomers Gold C (Euro 35-36) fins provide an improved foot pocket formulated from soft natural rubber for increased comfort. The short blade encourages shorter, faster kicks for additional propulsion through the water. The Zoomers Gold Fins are an ideal training fin for cardiovascular conditioning and speed training. Its short blade promotes shorter and faster kicks to improve technique and build leg strength. These swimming fins also help increase ankle flexibility and range of motion for a more efficient kick. This is a great teaching tool for swimmers of all levels to help support and improve their kick. Get one size higher up if you are in-between sizes or have a wide foot.