Louis Garneau - X-Lite Bike Jacket Polyester The X-Lite 19 fabric is ultralight, wind-breaking, and breathable. The X-Lite Mesh provides optimal ventilation. The X-Lite Jacket is one of the lightest jackets on the market (approximately 63g or 2.2oz) and can be compressed and stowed inside a collar pocket. Features stretch trim at wrists and hem and articulated elbows for a good, secure fit. The narrow back opening allows access to jersey pockets. Features zip garage for comfort and reflective accents for visibility.