Zoomers are a unique swim fin that utilize patented short-fin technology to promote a shorter, faster kick. They are designed to provide the ideal amount of propulsion for perfecting the swimming kick and stroke, allowing for better form over longer periods of time. Sizes: A = Mens1-2, Womens2-3...B = M2-3, W3-4...C = M3.5-5, W4.5-6...D = M5-7, W6-8...E = M7-8.5, W8-9.5...F = M8.5-10, W9.5-10...G = M10-11.5, W11-12.5....