Klim jackets and pants are always \"empty\" in terms of temperature comfort and insulation. To add comfort, you can mix and match your own favorite combination of under and mid layer to reach your ideal level of comfort and versatility. The Klim Aggressor Cool series provide a cooling and comfort as an under layer to wear in combination with any kind of motorcycle gear. The Coolcore patented fabric wicks sweat and moist and ensures you don\'t stick to your jacket anymore. Sometimes for hot weather conditions, adding a layer of clothing is the answer!