Think lightweight running shoes are just a fad? Think again. Thirty percent of total performance running footwear sales in October 2013, which was up 22 percent when compared to the year ago period, came from lightweight running. “Innovation continues to set the pace,” says Marshal Cohen, chief industry analyst. “Consumers are looking for athletic shoes that will perform better than earlier models with a lighter, more comfortable weight. We have also noticed an attraction to brighter, bold colors.