Laguna fin company’s surf ii swim fin...Features:
-high powered, computer designed blade angles that deliver maximum mobility & stability
-neoprene foot pocket
-foot pocket & blade angles prevent ankle torque & create a powerful thrust
-adjustable instep & heel straps
textured, anti-slip sole with flush vents
-blades have calibrated side ribs that extend above & below the blade’s planning surface for enhanced water channeling, while adding strength to the blade length to prevent unwanted distortion during powerful kicks.

size chart:

s = size 4-5
m = 6-7
ml = 8-9
l = 9-11
xl = 11-13