The key to every fin is having a pocket that fits your foot. If there is extra space in the foot pocket you are wasting energy and movement. The Sherwood Scuba Elite Open Heel Fin is a lightweight, high performance dual-composite fin blade featuring full-length power rails and a central flex channel with FIVE Foot Pockets! Sizing: XS Men’s 5-6, SM Men’s 7-8, MD Men’s 9-10, LG Men’s 11-12, XL Men’s 13-14. The open heel foot pocket is held secure and comfortable with a unique and highly stretchable silicone heel strap. The Sherwood Elite fin from Sherwood Scuba is the elite choice for power and performance.