The next step in perfecting your swimming workout is the use of the patented Finis Blue Zoomers fin. It is designed to promote speed with a shorter faster kick. The smaller blade makes the legs work harder without depleting the leg muscles. This provides a high intensity workout over a longer period of time. Zoomers are a proven training item with swim coaches. Blue Zoomers--for novices and intermediate swimmers. Men's sizes; women, order one size down.