Now that I'm gonna be taking rides during the winter on sunny days I'm wondering how much do those hand guards help keeping your hands warm. I had regular motocross type gloves on during my last ride and my hands were really cold riding in mid 40's temps. I know I probaly need better gloves but have been thinking about the hand guards with metal protector bars anyway. What about heated grips? Do they make them for motorcycles and does anyone have them?