FINIS Zoomers Fins Zoomer fins cause enough resistance to firm and tone the legs and core muscle groups. Zoomers come in two models. Colors: Red or Blue. G fits shoe sizes 10-11.5 male 11-12.5 female 44-45 European Red Zoomers are for swimmers with flexible feet, ankles and a strong kick. Blue Zoomers are softer and recommended for most swimmers.