New Era San Francisco 49ERS On-Field Sideline Bobble Knit. Rendered in franchise colours, the crown features a 'SF’ wordmark on the front and a '49ERS’ wordmark to the rear. As well as a cool bobble top and comfort-enhancing fleece lining, the design also boasts an upturned cuff, on which the team logo is applied to the front, an NFL shield to the rear and our trademark New Era flag to the left.