This innovative Speedo Switchblade rubber fin offers a whole new angle on training. Engineered with a unique 10ï¿ blade angle to provide maximum stability and engagement throughout the kick cycle. Allows you to dramatically increase your kick cadence without sacrificing technique. Angled blade maximizes down kick segment, maximizing propulsion. Extended foot pocket allows for ultimate comfort. Midfoot flex points help eliminate cramping. Sculpted side rails engage hip rotation and down kick drive. A team of industry experts deconstructed 40 different fins and worked with countless athletes on the quest to develop the Switchblade. Go behind the design to see why this is the fin every swimmer's been asking for. Switchblade won't break the surface of the water. Promoting better stroke techniques, it's engineered to help swimmers increase their kick cadence with ease and fluidity. Feel faster and more comfortable with every kick. The delta-shaped blade with a notched tip is proven to maximize drive, propulsion and stability. Sculpted side rails add strength and stability. 100% natural rubber is very flexible, so the fins feel like a natural extension of the foot while providing a snug but comfortable fit. This non-vented full foot designed fin is available in multiple sizes.