SPEEDO Optimus Training Fins SPEEDO Optimus Training Fins SPEEDO Optimus Training Fins SPEEDO Optimus Training Fins SPEEDO Optimus Training Fins SPEEDO Optimus Training Fins SPEEDO Optimus Training Fins SPEEDO Optimus Training Fins SPEEDO Optimus Training Fins SPEEDO Optimus Training Fins SPEEDO Optimus Training Fins SPEEDO Optimus Training Fins SPEEDO Optimus Training Fins SPEEDO Optimus Training Fins SPEEDO Optimus Training Fins SPEEDO Optimus Training Fins SPEEDO Optimus Training Fins SPEEDO Optimus Training Fins SPEEDO Optimus Training Fins SPEEDO Optimus Training Fins SPEEDO Optimus Training Fins SPEEDO Optimus Training Fins SPEEDO Optimus Training Fins SPEEDO Optimus Training Fins SPEEDO Optimus Training Fins SPEEDO Optimus Training Fins 100% rubber, natural flow of a flutter kick, angled blade shape creates balanced propulsion while maintaining kicking and stroke tempo, soft orthopedic foot pockets for comfortable extended use. Shoe Size Equivalents XXXS 11-13 Kids XXS 1-3 Kids XS 3-4 S 5-6 M 7-8 L 8-9 XL 10-11 XXL 12-13