Designed specifically for Float tubing. Adjustable foot pocket allows you to use wading boots or tubing socks. Easy kicking, powerful, and fast. Simply lift your foot to activate the SNAP of the blade and let the water acclerate through its split-V shape. Upcurved blade focuses water into thrust, instead of bobbing you up and down as when wearing flat fins. One size fits most. They have neutral buoyancy so they won't sink.