The only adjustable adult snorkeling fin we offer is the Current Fin. The soft rubber foot pocket does not require booties or neoprene socks, as the over-sized rubber heel strap is designed to reduce chaffing. This strap is easily adjusted with convenient swivel buckles. The Current fin is very easy to kick with a blade designed to cup the water when kicking, resulting in increased power with decreased kicking effort. Benefits Adjustable strap allows each fin to fit a range of sizes Soft foot pocket eliminates need for neoprene sock Flexible blade delivers excellent propulsion from each kick