The Worlds Best Surf and Swim Fins. DaFiN's are the #1 choice of beach lifeguards, bodysurfers and top waterman around the globe and the official fin of the Hawaiian Lifeguard Association. DaFiN know's the ocean like the North Shore Lifeguards who helped test and design them. Made of soft and stiff rubber, to achieve power and control, these fins function efficiently in the surf zone, and in waves. Natural Malaysian rubber, in a variety of colors.