Leather and the street rod. Most street jackets get a little tight, as in, form fitting. The street rod has relaxed fit in the shoulders and arms for the extra comfort while riding. The fit lends itself to an upright riding style while keeping the jacket snug in place with no flapping around. The 1.2-1.4 mm full grain leather jacket ha perforations to keep things cool and zip-out thermal vest helps keep the temperatures in check if they drop. The standard CE approved armor has great protection for those unforeseen bumps. There are adjustments for the waist to keep the custom fit and the wrists are zipper only.