SPEEDO Optimus Training Fins100% 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 EquivalentsXXXS 11-13 KidsXXS 1-3 KidsXS 3-4S 5-6M 7-8L 8-9XL 10-11XXL 12-13

• 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