Shoes For CrewsClean; athletic style in a lightweight; flexible design. Extremely lightweight; the Vitality weighs in at just 9 oz. per shoe. The water-resistant; breathable mesh and leather upper gives it the look ... moreof a cross-trainer; while our patented SFC Mighty Grip outsole gives it slip resistance. The Vitality has a removable cushioned insole; reinforced heel and a padded collar and tongue.